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Where do I find Terrazzo Chips to make a terrazzo repair and how do I match the matrix?
Viewed 4535 times since Mon, Oct 8, 2012
Where do I find Terrazzo Chips to make a terrazzo repair and how do I match the matrix? There is a supply company called Terrazzo and Marble Supply located in Michigan that you can purchase the chips from. They can also match the matrix for you if... Read More
What should I tell my customers that ask how often should they reseal their marble shower walls?
Viewed 3008 times since Wed, Sep 5, 2012
This depends on several factors, including how often the shower is used and what type of sealer was originally applied. If water is no longer beading on the shower walls, sealer reapplication would be advisable. As a general rule of thumb it is best... Read More
How long should an average diamond abrasive last? I have tried several different brands and cannot seem to get an average as to how many square feet I can get per set?
Viewed 2326 times since Wed, Sep 5, 2012
There are many factors that contribute to how far a diamond abrasive will go. The type of stone, how abrasive the stone is, how severe the lippage is, the equipment you are using, etc.all contribute to the wear of the diamond. In other words, it is... Read More
Is it possible to restore a marble floor that has small two inch granite insets without touching the granite? The granite is in good shape but the marble is worn and dull.
Viewed 1880 times since Wed, Sep 5, 2012
There are several tricks you can use to hone and polish the marble without touching the granite. The best method is to cover the granite insets with duct tape. If you use resin bond diamonds starting at a 120, the diamonds should glide over the duct... Read More
I am having trouble applying a poultice to a wall, it keeps running down. How can I get it to stick to the wall?
Viewed 1796 times since Wed, Sep 5, 2012
The easiest way to apply a poultice to a wall is to first use less water or chemical in the poultice. This will keep it from sagging. Apply it thin. Another technique is to apply the poultice to a piece of plastic first. Then place the poultice and... Read More
We have a black marble floor that appears to have raised veins. In other words the white veins in the marble appear to be lifting up and in some places are falling apart. What causes this to happen?
Viewed 1642 times since Wed, Sep 5, 2012
I am assuming that the black marble you are referring to is negro marquina. If this is the case you will find that this type of black marble is very susceptible to spalling of the veins. Over-polishing with either powder polishes or recrystallization... Read More
A lemon slice sat on our marble bar top overnight and left a white mark. How can we remove this mark?
Viewed 1559 times since Wed, Sep 5, 2012
The acid in the lemon has etched the surface of the marble. The only option is to re-polish or hone the marble. Polish the etched area using a powder polishing compound. Work the powder into a slurry using a white pad and a slow rpm hand buffer. If... Read More
I have to polish a narrow strip of granite that runs as a border along side a strip of flamed granite. The polished granite strips are about six inches wide. How do I hone the polished granite without honing the flamed granite?
Viewed 1548 times since Wed, Sep 5, 2012
The situation you describe is becoming increasingly popular. It seems designers and architects are mixing different finishes together making it very difficult to restore the polished portion. The only way to restore the polished granite without... Read More
Is it possible to polish a terrazzo floor like marble?
Viewed 1536 times since Wed, Sep 5, 2012
Terrazzo is in fact a marble floor. Terrazzo is comprised of marble chips mixed with Portland cement and polishes just like a marble floor. Many terrazzo contractors hone the terrazzo to about a 80 or 120 grit and apply a wax coating. If you continue... Read More
Is there a filler I can use on travertine that will take a polish? I tried using grout and it will not polish.
Viewed 1527 times since Wed, Sep 5, 2012
Yes, there are several fillers that can be used that will take a polish. If the area is small you can use a polyester filler. These polyesters are sold at Stonecare CentralPRO.com as well as marble supply houses as Akemi, K-bond, Tenax, etc. You will... Read More
What do I tell my customers when they ask what type of floor mats do I recommend for use on a marble floor?
Viewed 1501 times since Wed, Sep 5, 2012
Tell them to stay away from rubber-backed mats. Rubber-backed mats, as well as some jute-backed mats, can stain a marble floor. Advise them to use only cloth-backed floor mats. Be sure to take them up at least once week to avoid moisture build-up.... Read More
I have to rehone and polish a black granite lobby floor located in an office building. Most of the granite is in good condition and doesn’t really need any work. The only area that is worn and dull is a path leading from the entrance door to th
Viewed 1488 times since Wed, Sep 5, 2012
To answer your question simply, yes, it is possible, but requires a great deal of experience and is very time consuming. At the time of this writing there are only several companies that can blend black granite with a factory appearance. The... Read More
How much weight is required to hone and polish granite?
Viewed 1481 times since Wed, Sep 5, 2012
Depending on which machine you use the more weight the better. If your using a single disc machine use at least 75 pounds. It is important that your machine operate properly with the added weight. For this reason make sure you operate at least a 1 Read More
When I polish a marble floor I am having trouble with the edges of the tile being shinier than the rest of the floor. This shiny edge is a thin line running from one corner of the tile. It appears to be on the low side of the tile where my diamonds d
Viewed 1480 times since Wed, Sep 5, 2012
The shiny edges are what we call "v" edges, since they normally form a "v" along two edges of the tile. You are correct in that these "v" edges are areas that are lower than the adjacent tile and your diamonds are not touching these areas. The best... Read More
Does a stone have to be completely dry before applying an impregnator?
Viewed 1474 times since Wed, Sep 5, 2012
The stone should be completely dry for the sealer to work at its best. If the stone is still wet the sealer will not penetrate areas were water is present and therefore that portion of the stone will be unsealed. If the stone has some moisture(damp),... Read More
When I try to powder polish a Botticino marble it gets dull spots. The more I polish the duller these spots get. I’ve tried rehoning with a higher grit and I still get dull spots. Is there a way I can polish without getting dull spots?
Viewed 1461 times since Wed, Sep 5, 2012
Some botticino marble have areas that are soft. These soft areas are the cause of the dull spots you describe. The polishing powder is eroding these soft spots. There are several techniques for polishing these dull areas. First, do not use polishing... Read More
My customer has a white pickled Mexican tile floor that is peeling and has asked if it can be re-pickled?
Viewed 1455 times since Wed, Sep 5, 2012
Pickled Mexican clay tiles are pickled at the factory. It is difficult to re-pickle the tile after it has been installed. This is a job for a professional, and it will be very expensive, since all the grout will have to masked to keep the pickling... Read More
There is a wide, dull spot on my marble foyer where the front door opens and closes. How can this be fixed?
Viewed 1442 times since Wed, Sep 5, 2012
The marble has probably been scratched by the underside of the door. First, trim the door bottom so that it does not scrape on the marble. Then have the dull spot refinished and polished. You will probably need to start with a course abrasive(60#).... Read More
Can flamed granite be ground and honed and brought back to a polish?
Viewed 1439 times since Wed, Sep 5, 2012
It is possible, but very time consuming. It would take about 15 minutes per square feet to restore an average granite floor. In the case of flamed granite it may take this long just to grind the tile flat. If the flamed granite is at least 3/4 of an... Read More
Can I powder polish a marble floor that has been recrystallized?
Viewed 1422 times since Wed, Sep 5, 2012
If the marble has only been recrystallized a few times it is possible to powder polish over the recrystallization. The powder will remove the recrystallized surface . If the marble has been recrystallized heavily, powder polishing may be able to be... Read More
I have been asked to polish a newly installed marble floor and the grout is cracking. What causes this and can it be repaired?
Viewed 1417 times since Wed, Sep 5, 2012
The are several reasons why the grout may have cracked. The installer may have used too much water when he mixed the grout causing it to crack or there may be movement in the floor causing the cracking. To repair the grout you can overlay a thin coat... Read More
How do I remove oil spots from my Mexican tile floor? Grease splattering from the stove is causing staining all over the floor.
Viewed 1412 times since Wed, Sep 5, 2012
Mexican tile is a clay terra cotta-type product, and is very absorbent. In order to remove the oil a poultice is necessary. Refer to "Stain Removal Guide for Stone" and carry out the procedure it describes. If the stain is not removed after four or... Read More
We have a stone wall made of limestone. It has a heavy growth of moss and lichens all over it. Will this growth deteriorate the stone?
Viewed 1405 times since Wed, Sep 5, 2012
It may. Lichens and mosses produce oxalic acid, which can destroy calcium based stones. Since they are considered plants they will also attract moisture which can cause all kinds of problems with the stone, including spalling. They can also cause the... Read More
I have been trying to polish a white thassos marble and cannot seem to get a shine. Any suggestions?
Viewed 1389 times since Wed, Sep 5, 2012
White thassos marble can be tricky to polish. One technique that works is to start polishing as you would normally polish. Normal is working the powder into a pasty consistency. Continue to work the slurry until it is totally dry. Continue to work... Read More
I was told that I can polish marble after the 400 grit and do not need to use diamonds higher than 400. Is this possible?
Viewed 1378 times since Wed, Sep 5, 2012
Yes it is very possible. Many experienced craftsman can powder polish marble immediately after the 400 grit. It takes a little practice but can save you a ton of money on abrasives. One word of warning, this method will not work on all marble. This... Read More
How can I remove fingernail polish from my customer’s granite vanity?
Viewed 1370 times since Wed, Sep 5, 2012
The procedure depends on how long the nail polish has been allowed to set. First, try removing it with acetone and a clean rag. If it has dried completely, it may be necessary to scrape the polish with a sharp razor blade, followed by cleaning with... Read More
I am having trouble polishing a travertine floor. I can get a good polish except for the fact that I have a lot of dull spots on the floor. Why is this and is there a way I can make the shine even across the surface?
Viewed 1341 times since Wed, Sep 5, 2012
Travertine is a marble that has a lot of holes. These holes are filed at the factory with a colored Portland cement. When you polish the marble the fillers do not take a polish. This is why you get dull spots. TIP If you need to fill these holes try... Read More
The polishing powder that I’m using is dulling the marble when I polish. What’s wrong?
Viewed 1289 times since Wed, Sep 5, 2012
There are several reasons why the polishing powder is dulling the marble. First, check to see if the powder you are using is a marble polishing powder and not granite polishing powder. Granite powders do not work effectively on marble and may dull... Read More
My customer used to have a large ficus tree on their marble floor. When it died and they removed it a brown stain was left where the plant had been. What should I use to remove this stain?
Viewed 1215 times since Wed, Sep 5, 2012
The brown stain is the result of minerals from the soil of the ficus tree. This type of stain is difficult to remove and will require a poultice. To remove the stain, try a poultice with 50% hydrogen peroxide. Let the poultice stay on the spot for at... Read More
I have a very large wall to poultice - several thousand square feet. How can I apply the poultice to this large area?
Viewed 1186 times since Wed, Sep 5, 2012
If you use a poultice that is fine enough it can be sprayed on with a texture gun. These texture guns can be purchased at supply houses that specialize in stucco spraying. Mix a large quantity of poultice in a five gallon bucket and mix using a slow... Read More
I tried honing a marble vanity top and the surface of the top is powdering and I cannot seem to to get the shine back. What’s going on?
Viewed 1157 times since Wed, Sep 5, 2012
Are you sure its a marble top? It sounds like you tried to hone a cultured marble top. Cultured marble may look like real marble but is actually a plastic resin that is coated with a very thin layer called a gel coat. If you try to hone cultured... Read More
I have been poulticing a stain on a red granite counter top using a clay poultice and a commercial degreaser. When I remove the poultice the area where the poultice was is very dark and does not seem to dry out and lighten. What causes this and how c
Viewed 1082 times since Wed, Sep 5, 2012
This is a very common problem on granite. Granite is a very porous stone, more porous than most marble. Because of its porous nature, granite has the ability to retain a great deal of moisture. The dark area in this case may simply be excessive... Read More
My customer’s building has unglazed terra cotta tile on it. Is it safe to use an acid to clean it?
Viewed 1065 times since Wed, Sep 5, 2012
Generally, an acid will not cause any problem with an unglazed terra cotta. However be sure to use a acid specifically called for in the cleaning of terra cotta. Follow the directions carefully and be sure to rinse throughly to remove all acid... Read More
What is the best way to polish the edges and corners of a marble floor? The machine I use cannot fit into the corners.
Viewed 1039 times since Wed, Sep 5, 2012
The best way is not to polish them at all. Edges and corners rarely require any work since they are not subject to foot traffic. If for some reason you need to hone or polish them, there is a machine available that has a triangular pad that can get... Read More
Can a poultice be used on other surfaces beside stone?
Viewed 977 times since Wed, Sep 5, 2012
Yes, most poultice powders can be used on any porous surface such as concrete, Mexican tile, ceramic tile, porcelain tile, cultured marble, CORIAN etc. Always test first for compatibility. TIP: Poultice powders work very well for removing oil spots... Read More
How do I remove pencil marks from a white marble stair?
Viewed 965 times since Wed, Sep 5, 2012
The answer to this is surprisingly simple. Pencil marks can frequently be removed simply by erasing them with a pencil eraser. If the eraser trick does not work, then a poultice of denatured alcohol and a poultice powder will need to be applied.... Read More
What gives stone its color?
Viewed 877 times since Wed, Sep 5, 2012
The color in all stone is derived from minerals and organic matter. For example red marbles are red due to the presences of iron. Green marble gets its color from a mineral called serpentine and so forth. There are several excellent books on rock and... Read More
Can a poultice be used outdoors?
Viewed 876 times since Wed, Sep 5, 2012
Yes, but be sure to cover with plastic in the case of rain. You may find that the poultice may dry too rapidly outdoors. Try covering with black plastic to block the sun light. TIP: To prevent rain from washing the poultice away you can place a five... Read More
What is the ideal temperature for a poultice to be applied?
Viewed 846 times since Wed, Sep 5, 2012
There is no ideal temperature. Hoowever poultices will work best at temperatures above 75 degree F. Do not apply poultice below freezing temperatures. CAUTION: Do not attempt to heat a poultice. Certain chemicals will ignite or explode when heated.... Read More
What is the best way to apply impregnating sealers? Can I mop it on?
Viewed 839 times since Wed, Sep 5, 2012
There are several methods of sealer application. Most sealers can be sprayed on, mopped on or applied with a lamb's-wool applicator. I prefer the lamb's-wool applicator because it prevents streaking. Before choosing a method of application it would... Read More
I have heard that using distilled water in a poultice is better than tap water. Do you recommend it?
Viewed 836 times since Wed, Sep 5, 2012
Yes, if distilled water is available I would use it. Tap water sometimes can contain minerals such as chlorine, iron and others which can retard stain removal. TIP: If you use tap water in a poultice and the area the poultice is placed turns yellow... Read More
My technician has told me that after completing the routine maintenance then finishing off with mopping a marble tile floor on a hotel maintenance contract, there are streaks across it when it dries. We have tried several different cleaners, yet I al
Viewed 828 times since Wed, Sep 5, 2012
The streaking may be caused by any one of a number of problems. The mop you are using may be dirty. Use a clean string mop and make a point of only using it for the marble floor. Wring the mop out several times as you clean the floor. Are you using... Read More
I have been told that darker marbles are softer than lighter colored marbles is this true?
Viewed 825 times since Wed, Sep 5, 2012
No, it is absolutely false. There are soft, dark marbles and there are hard dark marbles. For example, negro maquina is a very soft marble. On the other hand Vermont Green is a very hard dark marble. Do not rely on color alone to determine the... Read More
How much additional weight do I need to add to my floor machine for honing marble floors? I get different answers from different manufacturers and suppliers.
Viewed 823 times since Wed, Sep 5, 2012
The addition of weight will depend on a number of factors. The type of machine you have, how many diamonds you are using, the size of your drive plate, etc, etc. This is the reason you are getting so many different answers. As a general rule of thumb... Read More
Can I speed up the drying time of a poultice?
Viewed 813 times since Wed, Sep 5, 2012
Yes, but only if the poultice has stayed wet for at least 12 hours. If the drying time is too rapid there may not be adequate time for the chemicals to react. Drying time can be accelerated by placing fans near the poultice. TIP: Janitorial supply... Read More
The polishing powder I am using is leaving a film on the surface of the marble. This film has a rainbow color appearance. What is this and how can I prevent it?
Viewed 802 times since Wed, Sep 5, 2012
Certain brands of polishing powders contain shellac. If the powder has a yellow to gold tint to it, then it may contain shellac. The rainbow appearance and film is the shellac. Chances are you are using too much powder. Try repolishing the marble... Read More
I just honed a red granite floor and would like to put some darker color back in to it. Is there some sealer or treatment I can apply to darken it?
Viewed 799 times since Wed, Sep 5, 2012
Yes, there are several color enhancing sealers available that will darken the granite as well as seal it. Check with Stonecarecentral.com. Read More
How much water is necessary when honing a marble floor with diamonds?
Viewed 789 times since Wed, Sep 5, 2012
That's a difficult question to answer but generally you will need enough water to keep the diamonds from clogging with slurry and enough to keep them lubricated and cool. The amount of water will also depend on the grit size, the speed of the machine... Read More
I tried polishing a green marble tile, I think it was called Taiwan green. The marble was shiny but it did not have the depth that most marbles have. Is there a technique I can use to get the depth and clarity?
Viewed 766 times since Wed, Sep 5, 2012
Many green marbles will not have the depth of shine that other marbles have. The greens from Asia are some of these types. The surface will have a good shine but little clarity. Unfortunately there is not much that can be done to give the stone any... Read More
Oxidation of Elemental Iron Within Stone Surfaces (Yellowing of Stone Surfaces)
Viewed 761 times since Mon, Sep 2, 2013
Recently I received a call from a very upset homebuilder. He told me he was building a two million-dollar home on the west coast of Florida and said that they had installed nearly 3500 square feet of a white statuary marble tile. Over the weekend one... Read More
I tried feathering a marble floor by staying away from the edges but when I finished I had a cloudy halo along the edge. What did I do wrong?
Viewed 752 times since Wed, Sep 5, 2012
Simply, you did not feather properly. This halo is the result of not properly overlapping you steps or you did not overlap enough. You will need to overlap at least two inches on each grit. Proper planning is a must if you want to avoid this halo.... Read More
I have a job on an historical church, built before the turn of the century. The church is made of a gray type granite and has been attacked by vandals with spray paint. How do we remove the paint without destroying the stone?
Viewed 741 times since Wed, Sep 5, 2012
There are several methods that can be used to remove spray paint. Since the church is an historical property I would highly recommend contacting a professional who has had experience with Historical Buildings. Time is of the essence, the quicker you... Read More
Is it safe to use a store-bought cleaner/wax combination on my marble floor?
Viewed 729 times since Wed, Sep 5, 2012
I would advise against it. Although these are excellent products for vinyl floors, most of them have a tendency to yellow and darken marble. If you must wax your floor, I would suggest that you contact a stone care supplier and purchase a product... Read More
If a marble floor has been recrystallized will it be more difficult to hone?
Viewed 725 times since Wed, Sep 5, 2012
It could be more difficult depending on how much the floor has been recrystallized. You might find that the floor will need to be ground with a sixty grit diamond to properly remove all the recrystallized layer. If you must hone the floor to remove... Read More
Should I use hot or cold water when mixing poultice?
Viewed 720 times since Wed, Sep 5, 2012
Always use cold to warm water. Certain chemicals will be become very reactive in hot water and can be dangerous. TIP: Many chemicals when mixed with water will generate there own heat. For this reason never mix poultice in a paper or Styrofoam... Read More
I used a stone cleaner that contains hydrofluoric acid on a polished granite and it etched the surface. I thought acid will not effect granite?
Viewed 709 times since Wed, Sep 5, 2012
Acids generally will not harm granite but hydrofluoric acid is the exception. Hydrofluoric acid will etch polished granite as well as glass. Never use HF on polished granite. Read MSDS and label directions. FYI: Hydrofluoric acid is a common chemical... Read More
I have a white marble floor that has been coated with a polyurethane -- the same type that is applied to wood floors. What is the best method to remove the urethane? Can I grind it off or will I need to use a stripper of some sort?
Viewed 706 times since Wed, Sep 5, 2012
Depending on how thick the urethane is you might be able to grind it off. Grinding can be difficult and can clog your abrasives. The best solution will be to chemically strip the tile. Use a stripper designed for removing polyurethane. Be careful... Read More
My four-year-old got hold of a black permanent marker and drew all over my white Thassos marble floor. How do I clean it off?
Viewed 706 times since Wed, Sep 5, 2012
First try cleaning with some acetone and a clean white rag. Blot the stain with the rag. Do not rub the stain, since this may only spread it around making it worst. Depending on how long the marker has remained on the floor it may require a poultice.... Read More
My customer has asked "How do I clean around the fixtures on my marble vanity top?" What should I tell them?
Viewed 703 times since Wed, Sep 5, 2012
This has always presented a problem. If the marble adjacent to the fixtures is severely pitted, I would recommend hiring a plumber to remove the fixtures and then hire you to refinish the vanity. Once the marble has been refinished, let them know to... Read More
Here is a question I am asked quite frequently. "My dog is not yet housebroken, and is constantly urinating on my marble floor. I’ve found that I can clean off the urine without staining, but a dull area is left afterwards. Also, how can I
Viewed 698 times since Wed, Sep 5, 2012
Let your customer know that urine contains acid which will etch the marble surface. As for the odor, pet shops and supermarkets carry several products which use enzymes to destroy the odor of urine. Follow the manufacturer's directions carefully.... Read More
What do I tell customers when they ask which is better for their countertops, marble or granite?
Viewed 698 times since Wed, Sep 5, 2012
Both granite and marble make excellent countertops, depending on the counter's intended use. Marble is sensitive to acids, which can make it difficult to keep polished in a kitchen. Granite, by contrast, is acid-resistant, and can make an excellent... Read More
When I am polishing with a powder the marble gets a dull, wavy appearance and sometimes looks rough and dimpled. What’s going on?
Viewed 697 times since Sun, Jul 15, 2012
You are describing what is known as "orange peel.” Orange peel is the result of using too much acid on the marble. In other words, most marble polishing powders contain acid and you are either using too much powder or working the powder too... Read More
What is the best way to clean mildew off of marble shower walls without dulling the shine? I have used soap-scum removers in the past, but they only dull the marble.
Viewed 693 times since Wed, Sep 5, 2012
There are several products on the market that will remove mildew from tile, but they will also etch any polished marble surface. I suggest the following technique: Dilute one cup of household bleach in one-half gallon of cold water; add several drops... Read More
A glass of iced tea was spilled over a newspaper that was on top of my customer’s marble dining room table. The newspaper ink has stained the table. What’s the best way to remove this stain?
Viewed 690 times since Wed, Sep 5, 2012
Here's a way to be a hero for your customer. The newspaper ink has probably soaked into the marble, and may require a poultice to remove the stain, but first have them try cleaning the area with a white cloth and some acetone. Be sure to caution them... Read More
When we removed the carpet tack strips from a terrazzo floor it pulled large chucks out of the terrazzo. Is there a method to remove the tack strips that will not destroy the terrazzo?
Viewed 689 times since Wed, Sep 5, 2012
The best way to remove carpet tack strips is to cut the nails off flush with the terrazzo. Use an angle grinder and a dry diamond saw blade. If you do not have an angle grinder and the job is small you can take a hack saw blade and cut the nails off... Read More
Can cracks in terrazzo be repaired? How?
Viewed 688 times since Wed, Sep 5, 2012
Yes, cracks can be repaired. Depending on the width of the crack, it can be filled with a polyester resin. If the crack is small, clean it thoroughly with acetone, making sure to remove all dirt; a dental pick may prove useful here. After the crack... Read More
The granite panels above our fireplace have developed several dark circles near the corners of each panel. The granite is only three months old. Should I call the contractor and have them replaced?
Viewed 688 times since Wed, Sep 5, 2012
I would call the contractor, but it may not be necessary to replace the panels. These dark circles may be the result of moisture bleeding from the setting mortar. It is common for panels to be installed by spotting the backs of the panels with... Read More
Several weeks ago, my clients’ hot water heater developed a leak and flooded their kitchen floor. The floor is a white statuary marble, and it is starting to turn yellow. It is ten years old and they say they never had this problem until the fl
Viewed 685 times since Wed, Sep 5, 2012
The problem you describe is unfortunately very common with certain white marbles. Many marbles contain naturally occurring iron as part of their mineral make-up. When the stone is exposed to water for any length of time, its iron content begins to... Read More
Does it matter which brand of polishing powder I use. I have tried several and some work well and others do not, what’s the difference?
Viewed 683 times since Wed, Sep 5, 2012
Marble polishing powders are made of mild abrasives such as aluminum oxide and tin oxide. They also may contain an acid known as oxalic acid. The percentage of acid to abrasive differ somewhat from brand to brand. Powders with a high percentage of... Read More
I own a white marble statuary bust that is yellow and dingy-looking. What can I use to brighten it up?
Viewed 682 times since Wed, Sep 5, 2012
Old marble sculptures can be made out of marbles that contain iron. Over time, the iron becomes oxidized and turns yellow. If the yellowing you are observing is the result of iron staining, it cannot be removed. If the yellow is only surface dirt,... Read More
Efflorescence in Historic Masonry – REMOVAL AND PREVENTION
Viewed 678 times since Mon, Sep 2, 2013
The crystallization of soluble salts in historic masonry causes severe deterioration of the substrate. This crystallization is called subflorescence. These salts are derived from several sources, including salts within the substrate, pollution,... Read More
What is a breccia marble?
Viewed 665 times since Wed, Sep 5, 2012
Breccia is an Italian word for breach or broken pieces. When marble is formed deep in the earth it will sometimes be exposed to earthquakes, which will break the marble into many pieces. Over thousands of years the marble will glue itself back... Read More
What’s the best way to remove cigarette burns from a marble vanity top?
Viewed 660 times since Wed, Sep 5, 2012
Cigarette burns will leave a yellow nicotine stain, which can be difficult to remove. The heat from the cigarette can also melt the stone. The melting damage can only be repaired by honing the marble. The yellow nicotine stain can be removed by... Read More
I always seem to have trouble honing and polishing the marble along the baseboards. It is very time consuming honing and polishing with a hand machine. Is there an easier way?
Viewed 659 times since Wed, Sep 5, 2012
Blending the edges has always seemed to be a problem for marble refinishers. There are several methods that can make the job a little easier: Feathering - Most of the time the edges of a marble floor do not require any work. After all people do not... Read More
Someone told me that using the recrystallization process is harmful to the stone, is there any truth to this?
Viewed 658 times since Wed, Sep 5, 2012
The recrystallization method has been a topic of great controversy since its introduction to the United States in the late sixties and early seventies. There are several people who feel this process is detrimental to the marble and there are those... Read More
I just completed polishing a marble floor and the grout is covered with streaks and spots. I am sure it is not polishing powder. How can I repair the grout?
Viewed 658 times since Wed, Sep 5, 2012
Short of removing it and installing new grout I would try cleaning it with stone soap or neutral cleaner. Be sure to use a soft brush and scrub the grout lines throughly. If this does not throughly clean the grout you may need to replace it. TIP: The... Read More
I just installed new grout in a granite floor and after 24 hours it is all turning powdery. What can I do to fix it?
Viewed 656 times since Wed, Sep 5, 2012
The are many reasons why the grout becomes powdery. If the tile is very absorbent it will soak up most of the moisture from the grout preventing it from curing properly. Too much water added to the grout mix can also make the grout powdery. To repair... Read More
After cleaning a limestone building we noticed that there appears to be a brownish to yellow hue to the stone that wasn’t there prior to cleaning. Why is this occurring?
Viewed 647 times since Wed, Sep 5, 2012
This is a common problem with limestones and some marble. Most of the time we find that there is a high content of iron in the water you used to clean the stone with. I would recommend using a chelating agent in the wash water, EDTA (ethylene diamine... Read More
I am using a 400 grit, 5 inch metal bond diamond on a marble vanity and it is leaving scratches in a circular pattern. The next grit will not remove them. Am I doing something wrong?
Viewed 645 times since Wed, Sep 5, 2012
No, it doesn't seem you are doing anything wrong. The possible problem is that the metal bond diamond has a rough edge. This is another common problem with some of the metal bond diamonds. When they cut the diamond at the factory, the edge is... Read More
Is it possible to hone a polished marble floor without grinding it flat? Diamonds or bricks will not get into the low corners of the tile.
Viewed 642 times since Wed, Sep 5, 2012
A good way to hone an uneven, polished marble tile is to use loose grit. Silicon carbide is available in a loose form. To hone simply sprinkle some loose grit on the tile and work it with your floor machine and a white pad. TIP: Another way to remove... Read More
We have an old terrazzo floor that has been covered for years with wall-to-wall carpet. We want to remove the carpet, but it is held down by tack strips which have been nailed into the terrazzo. When I tried pulling up one strip, large chunks of the
Viewed 641 times since Wed, Sep 5, 2012
The tack strips can be removed by cutting the nails flush with the terrazzo. A hack saw blade can be wedged under the wooden strip and the nail can be cut. A faster method would be to use a diamond saw blade mounted on a right angle grinder. The... Read More
I have a new customer that just bought a house that has a beautiful marble floor. The floor has had several coats of wax applied to it. What is the best way to remove the old wax? Secondly, the customer says they want it to be re-waxed. Your thoughts
Viewed 635 times since Wed, Sep 5, 2012
Use Stonecare PRO Signature Stripper Degreaser for Marble. Always test the stripper in a small area to make sure there are no adverse effects. Chances are that when all the wax is removed, the marble will appear dull. Let your customer know that... Read More
After I recrystallize a floor the white grout is turning yellow. How do I remove this yellowing and more importantly how do I prevent it from happening?
Viewed 633 times since Wed, Sep 5, 2012
The yellowing is caused by the steel wool you are using reacting with the recrystallization fluid. It may also be from the waxes that may be found in the recrystallization fluid. To remove the yellow color you will have to scrap the grout with a... Read More
Will the marble slurry I collect in a wet vac be safe to dispose of down the drain?
Viewed 632 times since Wed, Sep 5, 2012
This will depend on what type of sewage system the drain has. If you are dumping slurry down the drain and the systems is on a septic tank you take the chance of upsetting the delicate balance of the septic system and killing the bacteria in the... Read More
Several days after I have polished a white marble floor there are blotchy light and dark areas. What are these and can I remove them?
Viewed 630 times since Wed, Sep 5, 2012
The blotchy pattern you are observing is probably moisture. When white marble becomes wet it darkens. When you apply water to the floor , as you do during the polishing procedure, you wet the floor and it darkens. The blotchy appearance will... Read More
I’ve noticed little white specks on my white marble floor. They seem to be within the marble and you can’t feel them. What are these, and how can they be removed?
Viewed 628 times since Wed, Sep 5, 2012
These white specks are called stun marks, and cannot be removed. They are the result of sharp objects hitting the marble causing an explosion of the crystals in the marble. High heels are a common cause of these marks, so avoid PRO TIP: Stun marks... Read More
I have been told that there is a shelf life to grinding bricks. I have been using the Frankfurt style bricks and I have many that are several years old. Do I run into the danger of the bricks being bad?
Viewed 619 times since Wed, Sep 5, 2012
Most bricks are made of material known as magnasite. The magnasite has a shelf life of about one year. If you have bricks that are made of magnasite and they are older than one year you risk the chance of them falling apart. There are newer bricks... Read More
The marble under the carpet in my customer’s front foyer has yellowed. What can I use to remove the yellowing?
Viewed 618 times since Wed, Sep 5, 2012
The yellowing is the result of moisture becoming trapped under the carpet. The carpet's jute backing or dyes from its rubber backing have bled into the stone. To remove this yellowing, try the following steps: Clean the area with a solution of an... Read More
I just cleaned a black marble floor with a wax stripper. As it dried, it turned white. I have tried rinsing it and nothing seems to work. Is it ruined, or can it be fixed?
Viewed 616 times since Wed, Sep 5, 2012
It is probably not ruined, but removing this whitish haze can prove difficult. If the black marble is an agglomerate, chances are the alkaline stripper has attacked the polyester resin that binds it together. If so, the surface will have to be honed... Read More
I just applied a sealer to my marble customer’s floor, and they have told me that it is sticky and they can’t seem to clean it up. What can I do?
Viewed 615 times since Wed, Sep 5, 2012
The sticky substance is residue, which can be difficult to remove. First, try cleaning the floor with mineral spirits and clean cloths. If this does not remove the residue, then stronger solvents may be necessary. Suggested solvents may be acetone,... Read More
I am about ready to grind , hone and polish a travertine floor. I realize I will need to fill the travertine. At what grit should I fill and with what type of filler should I use?
Viewed 609 times since Wed, Sep 5, 2012
If you intend to grind the travertine flat I would grind and hone to about a 120 grit. Apply the filler after the 120 grit. There are several fillers that will work. There are products that are called traverfills or you can use a non-sanded grout.... Read More
Is it advisable to hone a polished stone before applying a poultice?
Viewed 608 times since Wed, Sep 5, 2012
It is not necessary to hone a polished stone prior to applying a poultice but honing will open the pores of the stone allowing for increased dwell time of the chemical. TIP: If you hone the stone before applying the poultice make sure that the stone... Read More
How long after I hone and polish a marble floor can I recrystallize it?
Viewed 607 times since Wed, Sep 5, 2012
As mentioned above, the recrystallization process does not like moisture. The floor needs to be dry before recrystallization is applied. It may take at least 24 hours for the floor to dry depending on humidity and temperature. Purchase a moisture... Read More
We have a pink marble tile that has some brown veins and the veins are soft and coming out. Is there anything we can do to stop these veins from softening?
Viewed 604 times since Wed, Sep 5, 2012
The material you are describing is probably a marble known as rossa perlinio. This type of marble, when it is formed has mud running through it and this is what the soft veins are---mud. Unfortunately the only cure is to fill the veins as the erode... Read More
What’s the difference between a knife grade and a flowing grade polyester?
Viewed 603 times since Wed, Sep 5, 2012
The knife grade has a thicker consistency, similar to peanut butter. Flowing is more liquid and flows easily. The knife grade is good for filling holes over 1/8 of an inch. For smaller holes the flowing grade will penetrate better. TIP: Most... Read More
My customer is telling me they are having a lot of trouble with hard water spots on their polished granite shower. Is there anything we can put on the granite to prevent these spots?
Viewed 602 times since Wed, Sep 5, 2012
Yes, A good quality application of an impregnator should do the trick. It may also be helpful to install a water treatment system to reduce the calcium in the water. TIP: If you squeegee and/or dry the shower wall immediately after a shower you will... Read More
I have a large lobby of white marble and when we mop it there are streaks left on the floor. How do we eliminate the streaking?
Viewed 601 times since Wed, Sep 5, 2012
It sounds like you may be using an improper cleaner in your mop water or you are using a dirty mop. Try switching to a daily cleaner specifically designed for marble flooring. The Stonecare PRO Signature Professional Neutral Cleaner is an excellent... Read More
What is the best way to clean a gray slate floor? It streaks every time I mop it, and the mop seems to shed on the floor. What can I recommend to them?
Viewed 599 times since Wed, Sep 5, 2012
It sounds as though your slate floor has a rough finish which catches the fibers of the mop as it is dragged across the floor. First, it is recommended that the floor needs to be deep-cleaned to remove all dirt and grime. Next, apply a good-quality... Read More
The color on my customer’s red terrazzo floor has faded. Is there a way to bring the color back?
Viewed 599 times since Wed, Sep 5, 2012
There are several techniques that can be used to bring it back, but first it is necessary to determine why the floor has faded. If the fading is due to excessive wear from foot traffic, resurfacing and polishing should return the color. If the fading... Read More
I am having trouble coloring a polyester with black color. It seems that if I add too much color the polyester gets gummy and difficult to mix. I am trying to mix a deep black to match a repair in a black absolute granite, any suggestions?
Viewed 595 times since Wed, Sep 5, 2012
If you mix too much color with polyesters they will get gummy. I would suggest purchasing a black polyester. These are available from your stone chemical supplier. You may also want to try using an artists oil color called "Lamp Black". This is very... Read More
Is there an easy way to polish a marble wall surface?
Viewed 595 times since Wed, Sep 5, 2012
Polishing a wall is time consuming but you can speed the process by using the largest drive plate you can purchase for your polishing machine. I would recommend using at least an eight inch drive plate. TIP: If you use a seven or eight inch drive pad... Read More
I have a job to restore a tan marble floor that has several coats of polyurethane on it. I want to remove this coating and restore the stone to its original condition but the floor is located in a hospital and I cannot use any chemical that has a nox
Viewed 589 times since Wed, Sep 5, 2012
There are several ways to remove polyurethane coatings without using strong odored chemicals. New technology has arrived and there are some new products on the market available for removing these coatings and some have no odor at all. These chemicals... Read More
I have to restore an outdoor sign that is made of a black agglomerate marble, the sign is faded and is very gray. I performed a small test patch and I was successful at restoring the sign. The question I have is, what caused the agglomerate to fade a
Viewed 586 times since Wed, Sep 5, 2012
Agglomerate marbles are made of a combination of marble chips and a polyester resin. Polyester resins are very sensitive to ultraviolet light (UV) and therefore should not be used outdoors. To answer your question, yes, the marble will fade in a very... Read More
Will onyx polish like marble or do I need to use a different procedure?
Viewed 584 times since Wed, Sep 5, 2012
Onyx is very similar to marble and will react similarly. It can be honed and polished just like marble. FYI: Onyx can be identified by its translucent appearance with its veins running in a parallel pattern. Onyx is found mostly on countertops and in... Read More
I applied a water based penetrating sealer to a marble floor and it left a very thin film on the surface that has a rainbow color to it. I have tried everything to remove it and it won’t budge. How can I remove this film?
Viewed 583 times since Wed, Sep 5, 2012
This is a common problem with water based impregnators that contain sodium methylsiliconate. The film can only be removed by re-polishing the floor with polishing powder and a buff colored pad. If the film is real thick it may need to be honed off.... Read More
We have a Mexican tile deck all around our swimming pool. It is developing a whitish cast to it. Can this be cleaned and with what?
Viewed 581 times since Wed, Sep 5, 2012
This white cast is very common with Mexican tile. Hard water and chlorine from your swimming pool are depositing a white salt on the surface. To remove this white haze, a mild acid washing is necessary. Use a mild acid such as sulfamic acid ... Read More
I have been having trouble polishing a black marble floor. I cannot seem to prevent the polishing powder from etching areas that I just completed. How can I prevent the etching?
Viewed 579 times since Sun, Jul 15, 2012
This is a common problem with many of the marble polishing powders because they all contain oxalic acid. Acids of course will etch marble. To prevent etching you need to wet the areas you are not working on with water and the addition of either a... Read More
I have been hired to grind a green marble tile floor. The problem is that all the corners of the tiles are curled upward. Why did this happen and can I grind the tile without a problem.
Viewed 576 times since Wed, Sep 5, 2012
There is only one solution for this problem--replace the tiles. Some green marbles are very susceptible to curling when they are installed using a water based setting material. The installer should have used a water-less setting material such as... Read More
Is it safe to use a pressure washer on a marble wall? The wall is located outside a building?
Viewed 576 times since Wed, Sep 5, 2012
The use of a pressure washer on marble should be avoided. Pressure washing forces water into the pores of the stone and can cause the development of efflorescence. If you must use a pressure washer make sure that the operator is skilled. Do not use a... Read More
What is the difference between honing and grinding?
Viewed 576 times since Wed, Sep 5, 2012
These terms can be quite confusing. Generally grinding is the removal of large amounts of material from the surface of the stone. Grinding would be performed to remove lippage and to flatten a floor. Grinding grits are typically 60 grit and below.... Read More
Do I need to use special diamonds to refinish granite, can I use the same diamonds I use on marble?
Viewed 575 times since Wed, Sep 5, 2012
This will depend on what diamonds you purchase. There are special diamonds deigned for granite and there are companies who make diamonds that will work on both marble and granite. I have found that the special diamonds perform much better than the... Read More
Can I mix several different chemicals together in the same poultice for example can I use an acid and hydrogen peroxide together?
Viewed 575 times since Wed, Sep 5, 2012
Absolutely not. Never mix chemicals together unless you are instructed to on the products instructions. Mixing certain chemicals can be dangerous to you as well as the stone. CAUTION: There are many chemicals when mixed together can form a deadly gas... Read More
Why am I getting small holes opening up in red granite that I have honed and polished? The granite has a nice deep shine but has very small holes that give the surface an uneven appearance.
Viewed 574 times since Wed, Sep 5, 2012
Is there a guide or book that will help me identify all the stone I may encounter?
Viewed 573 times since Wed, Sep 5, 2012
The answer is yes and no. There are several books available that show types of marble, granite, limestone, slate etc. but, there is no one book that shows all the stone available. There are somewhere near 9000 types of stone or more in the world.... Read More
I am having trouble grinding a marble tile floor flat. It seems that the tiles are cracking at the corners, why is this happening?
Viewed 571 times since Wed, Sep 5, 2012
Sounds like you are dealing with a tile floor that has not been installed properly. A poorly installed tile will sound hollow when you tap it with a broom handle . The hollow sound is an air pocket under the tile. The material that the tile is set in... Read More
What’s the difference between a neutral cleaner and a stone soap?
Viewed 571 times since Wed, Sep 5, 2012
A neutral cleaner is a water based cleaner that contains surfactant (detergents) and wetting agents. They are called neutral because they have a pH of 7 which is neutral. A stone soap is similar to a neutral cleaner with the addition of a vegetable... Read More
The marble polishing powder I am using has discolored the pink grout. Why did this happen and can I fix the grout?
Viewed 570 times since Wed, Sep 5, 2012
Some grout colors can be bleached by the oxalic acid in polishing powders. You are always urged to perform a small test to determine if this might happen. It is possible to recolor the grout. There are several companies that sell grout colors which... Read More
What’s the best way to remove a polyurethane finish that was placed on my slate floor?
Viewed 570 times since Wed, Sep 5, 2012
Unfortunately, most polyurethane finishes require strong solvent-based chemicals for removal. Methylene-chloride strippers as well as a number of safe strippers are available, but be forewarned: removing polyurethane is a messy job. I know several... Read More
How do I prevent water from leaking through the baseboard edges and down onto the first floor. There is a small space between the tile floor and the wall.
Viewed 569 times since Wed, Sep 5, 2012
The best way is to seal this space with silicone or acrylic caulking. Run a bead around the perimeter of the base. When you are done with the job the caulking should easily peel off or you can leave it in place. CAUTION: If you use silicone caulking... Read More
How do I protect a silk wall paper surface? I have tried masking tape and even low contact tape and they both damage the wall paper.
Viewed 569 times since Wed, Sep 5, 2012
The best way to protect delicate surfaces such as these is to lean a section of stiff plexiglass or similar material up against the wall . These materials can be purchased in hardware and home centers in four by eight foot sheets. There is no need to... Read More
I have to hone and polish a marble floor in a department store. The marble butts right up against carpeting. Is there an easier way to protect the carpeting then taping it with plastic?
Viewed 569 times since Wed, Sep 5, 2012
I have found that you can insert a thin sheet of metal roof flashing between the carpeted edge and the marble. This creates a barrier and a splash guard and installs in minutes, is reusable and can be moved as you work. You will only need about a... Read More
Can the recrystallization process be used to maintain granite surfaces?
Viewed 569 times since Wed, Sep 5, 2012
Recrystallization has been used to maintain granite and can prove very successful. However, when recrystallizing granite you are not reacting the recrystallization with the granite. The reaction taking place is simply placing a thin wax like coating... Read More
When I cleaned a flamed granite sidewalk the individual granite tiles all have a dark picture framing around them. What is this and how do I remove it?
Viewed 567 times since Wed, Sep 5, 2012
The picture framing you describe is nothing more than moisture. As the tile dries the moisture is wicked to the edges of the tile. The picture framing will disappear as the tiles dry. TIP Sometimes this picture framing will deposit salts and cause a... Read More
What about polishing edges on a granite floor. Do you have any suggestions?
Viewed 566 times since Wed, Sep 5, 2012
The same problems with edges on marble also apply to granite. Try to avoid edges when polishing grnite, it can be very time consuming and very hard work. It may prove difficult to feather into the edge when polishing granite. If you experience this... Read More
Can steam be used to clean stone surfaces? We have silicone caulking on a granite sidewalk and steam from a hotsy machine is the only method that will take it off.
Viewed 565 times since Wed, Sep 5, 2012
Steam can be used effectively on stone surfaces but be careful if you use any chemicals such as alkalies. Rinse the surface throughly if using alkaline cleaners. TIP: Another good method for removing caulking, tar or chewing gum from granite surfaces... Read More
Which works better on granite, diamonds or bricks?
Viewed 563 times since Wed, Sep 5, 2012
Diamonds and bricks both work well on granite but the final results will depend on the skill of the operator. Generally bricks require the use of an Italian grinding machine and a much higher degree of skill than diamonds. Diamonds are much easier to... Read More
Is it possible to polish marble without using powders?
Viewed 559 times since Wed, Sep 5, 2012
Yes, it is. There are several different methods for polishing that do not use loose powders. One method is to use a polishing brick or a polishing pad. The polishing bricks are often called 5x bricks . If you decide to use these bricks you will need... Read More
Can slate be polished like marble?
Viewed 559 times since Wed, Sep 5, 2012
No, slate does not polish very well. The only way to put any kind of shine on slate is to apply a coating. There are several brands of acrylic coatings designed for slate and other stone. Check with your local janitorial supply. There are basically... Read More
I have these circular scratches in a large granite floor. The scratch pattern is in a row of three in each tile and is about ten inches in diameter. The tiles are 12 by 24 inches and the scratch pattern runs perpendicular to the longer edge of the ti
Viewed 558 times since Wed, Sep 5, 2012
If these scratch patterns are what I think they are then they probably occurred during fabrication. Some polishing machines have ten inch diameter polishing heads. It is not unusual to have these patterns show up after the floor has been polished.... Read More
My customer’s terrazzo floor has a yellow cast to it. How can I remove this?
Viewed 558 times since Wed, Sep 5, 2012
First, you need to determine what is causing the yellow cast. If a carpet was at one time placed over the terrazzo, the jute or rubber backing may have bled color into the floor, turning it yellow. If the floor was waxed, the waxes will have yellowed... Read More
Every time I try to recrystallize a white marble floor, located in a bank lobby, it turns gray. This has been happening over the past several months. I don’t have any other problem with white marble except for this one bank lobby. Can you expla
Viewed 557 times since Wed, Sep 5, 2012
It sounds like there may be a moisture problem in the bank lobby. The recrystallization process does not work well when moisture is present. The gray you are getting is the result of moisture reacting with the steel wool and the recrystallization... Read More
How do you get the color back in a black absolute granite. I ground the tiles flat and used diamonds all the way to a 3000 grit as directed by the diamond manufacture. I have a good shine on the granite but it has a hazy white color and doesn’t
Viewed 557 times since Wed, Sep 5, 2012
Polishing black granite is very difficult and requires a lot of patience and is very time consuming. Here are several suggestions which should help: Make sure you are using a granite polishing compound.* Marble polishing powders will not work on... Read More
Is it possible to hone a granite floor without removing the lippage?
Viewed 556 times since Wed, Sep 5, 2012
It is very difficult to hone a granite floor without removing the lippage. If you do, the result will be an uneven shine. When granite needs honing and polishing the damage is relatively deep and will require starting with at least a 60 grit abrasive... Read More
How do you remove rust stains from a terrazzo floor?
Viewed 556 times since Wed, Sep 5, 2012
We have an interior granite wall that has some silicon caulking used in the grout joints. The silicon caused staining along the grout edges. We poulticed the stain and successful removed the staining, However after three months the stain is returning
Viewed 554 times since Wed, Sep 5, 2012
First, did you remove the silicon caulking. If the source of the staining is not removed it will continue to be a problem. I would recommend removing the silicon caulking and replacing it with a non-staining urethane caulking. If you did remove the... Read More
I have a marble floor that I have to grind, hone and polish the edges with a hand machine. Every time I do this I seem to be getting soaking wet due to all the water I need to use. Is there a way to do this with less water?
Viewed 553 times since Wed, Sep 5, 2012
The reason you require all the water is because your machine is too fast. Slow the machine down to the same speed as your floor buffer and you will require a lot less water. If your machine is not equipped with variable speed you can purchase a... Read More
I have a client with a polished granite floor that is extremely slippery. Is there any treatment we can put on top of it to increase its slip-resistance?
Viewed 553 times since Wed, Sep 5, 2012
A. There are several products on the market that will increase what is known as the Coefficient of Friction (COF). Both Stonecare Central PRO and Grout Perfect, for example, offer excellent products for this. Contact StonecareCentralPRO.com for more... Read More
I have been recrystallizing a black marble floor for several months and am noticing that the white veins are starting to raise up from the marble. Some of the veins appear brittle. What is happening?
Viewed 552 times since Wed, Sep 5, 2012
This is a common problem with black marbles. How often are you using the recrystallization process? I have seen this problem when recrystallization is over applied and performed too often. At this point the floor may need to be re-honed. An... Read More
Can I use a right angle grinder to hone and polish marble furniture tops?
Viewed 552 times since Wed, Sep 5, 2012
Never use a angle grinder to hone and polish any stone. Angle grinders have speeds that exceed 10,000 rpms and are too fast for honing and polishing. These high speeds will also destroy your diamond abrasives. TIP: If you have right angle grinder you... Read More
What type of mop should I use on my marble tile floor? Sponge or string mop?
Viewed 552 times since Wed, Sep 5, 2012
A string mop is preferable to a sponge mop. A sponge mop has a very small surface area, and can easily pick up sand and debris which will scratch the floor. It has been shown that after several swipes with a sponge mop, you are only spreading the... Read More
Can I reuse poultice powder?
Viewed 551 times since Wed, Sep 5, 2012
I would not recommend the reuse of poultice powder. Chemicals tend to lose their strength and may not store very well. I would always apply fresh poultice. TIP: An excellent poultice powder is diatomaceous earth, commonly referred to as DE powder. DE... Read More
I have an unusual problem. A customer of mine installed a limestone wall on the outside of his property. It is adjacent to and old limestone wall that has a growth of algae, mold and lichens. Can I get the new wall to look like the old one?
Viewed 550 times since Wed, Sep 5, 2012
In other words how can I grow algae and molds on the new wall? For this question I contacted a bryolgist at a major university. Bryologly is the study of molds and fungus. He gave me the following formula. Prepare the following mixture and paint it... Read More
What is the easiest way to hone a marble wall? It is taking forever to hone with a small three inch diamond.
Viewed 549 times since Wed, Sep 5, 2012
You are right. It will take forever to hone a wall with a three inch diamond. The fastest way is to attach a seven or eight inch drive pad to you hand machine and use a diamond that is at least that size or you can arrange three-three inch diamonds... Read More
What’s the best method for cleaning a flamed granite floor. I have tried using a black stripping pad but it doesn’t seem to get into the low areas, what do you suggest?
Viewed 549 times since Wed, Sep 5, 2012
The best way to clean a flamed granite floor is to use a brush known as a nylo-grit brush. These brushes are designed to reach into the low areas of uneven surfaces such as flamed granite. Nylo grit brushes are available at most janitorial supply... Read More
How do I dispose of used poultice? Is it safe to place down the drain?
Viewed 549 times since Wed, Sep 5, 2012
It will depend on what chemical you use in the poultice. The MSDS should tell you how to dispose of the chemical. FYI: A MSDS is an abbreviation for Material Safety Data Sheet. The MSDS will contain safety information, emergency phone numbers as well... Read More
Is there an ultra fast method for grinding a marble floor? It takes me forever to grind a marble floor flat.
Viewed 546 times since Wed, Sep 5, 2012
There are now available many course abrasives that can grind a marble floor flat in a hurry. These abrasives are called lippage plates. They work exceptionally well. Be sure to test in small area before grinding the entire floor. Some of these plates... Read More
Can I use an oscillating sander to hone a marble table top?
Viewed 545 times since Wed, Sep 5, 2012
Of course you can use an oscillating sander but an oscillating sander tends to leave a stray scratch pattern that can be difficult to remove. I have found the best method is to use a rotary polisher for best results. TIP: If the top is large enough... Read More
How important is it for a poultice to dry thoroughly?
Viewed 545 times since Wed, Sep 5, 2012
It is very important. If the poultice is removed while it is still wet it may not draw the stain from the stone. The drying action is what causes the stain to be removed. TIP: If you remove the poultice from the stain before it completely dries and... Read More
Can I mix my own polishing powder and do you have a suggested formula?
Viewed 544 times since Wed, Sep 5, 2012
Many experienced craftsman mix their own powders. All that is required are two ingredients. Aluminum oxide and oxalic acid. A good starting formulation would be 1 part of oxalic acid to three parts of aluminum oxide. Depending on what type of marble... Read More
This may be a stupid question but, is there any method for determining how old a stone is?
Viewed 544 times since Wed, Sep 5, 2012
First let me say, there are no stupid questions and the one you just asked is actually a good question. I am assuming you mean by age, how old the installation is and not how old the stone is. The stone itself is millions of years old. There are... Read More
The white veins in the black marble floor in my customer’s bathroom appear to be crumbling and disintegrating. What’s causing this, and can it be repaired?
Viewed 544 times since Wed, Sep 5, 2012
Black marble, especially Negro marquina, is very susceptible to spalling. Spalling is a condition in which the stone flakes off and falls apart. Several factors can cause spalling: excess moisture, choice of setting material and method, the polishing... Read More
What is the best solution for customers that have trouble keeping the grout on their travertine floors clean?
Viewed 543 times since Wed, Sep 5, 2012
Most of the impregnators on the market also work well as grout sealer. I would recommend throughly cleaning the travertine and the grout and applying a good quality impregnator to the travertine and the grout. Even the best impregnators and sealers... Read More
How long should it take to grind, hone and polish a granite floor?
Viewed 542 times since Wed, Sep 5, 2012
It all depends on several factors. Generally, granite will take much longer to grind, hone and polish then softer materials like marble. As a rule of thumb you can plan on spending about one minute per square foot per grit. If your using a system... Read More
Every time I hone and polish a marble floor I get a great shine but the floor looks like its wavy and has a rolling pattern to it. Is there any way to eliminate this wavy look?
Viewed 540 times since Wed, Sep 5, 2012
The wavy pattern you are describing is usually caused by honing with diamonds that are too flexible. Most of the time there is a flexible cushion where the diamonds attach to the drive pad. The diamonds float over the floor and do not hone the floor... Read More
After I have applied an impregnator there is a sticky film on the surface. When I walk on the surface I leave footprints. What is wrong?
Viewed 540 times since Wed, Sep 5, 2012
You most likely applied too much sealer and did not properly remove the excess. Wipe the floor with mineral spirits and dry buff the floor with a white pad or cloth. The correct way to apply most impregantors is to distribute a small amount on the... Read More
How do I determine the the hardness of marble?
Viewed 538 times since Wed, Sep 5, 2012
All minerals have a certain hardness. The hardness of a mineral is determined by performing a scratch test. A scratch test is based on the Moh's scale of hardness. A German scientist invented this scale by taking several known, pure minerals and... Read More
How do I remove hard water spots from a polished granite shower wall?
Viewed 537 times since Wed, Sep 5, 2012
If the spots are light a #00 steel wool pad may remove them. Use the steel wool dry. If the deposits are heavy use a solution of sulfamic acid and water. Sulfamic acid is sold under the name of sulfamic acid crystals and is used for cleaning grout.... Read More
How do I clean the polishing powder out of the grout lines on a marble floor?
Viewed 536 times since Wed, Sep 5, 2012
During the polishing try to keep the floor as wet as possible. Try to prevent the polishing powder from drying in the grout lines. While the floor is still wet apply a solution of stone soap and water, agitate the grout lines with the mop and pick up... Read More
How long should I continue to poultice a stain?
Viewed 536 times since Wed, Sep 5, 2012
There is no rule for the number of times a stain needs to be poultices. Generally if the stain is slowly disappearing I would continue to poultice. The average number of poultice applications will be about five. TIP: If after the first two poultices... Read More
Will application of an impregnator make the stone slippery?
Viewed 534 times since Wed, Sep 5, 2012
If the product you are using is a true impregnator it will not add or subtract from the slip-resistance of the stone. The impregnator is designed to penetrate below the surface of the stone. CAUTION: If an impregnator is used on a stone surface and... Read More
I have heard that there is a two step recrystallization process, what is this?
Viewed 531 times since Wed, Sep 5, 2012
There are several companies who promote a two step recrystallization process. The first step uses the standard recrystallization chemical and then is followed by an application of a second chemical containing waxes which places a higher shine on the... Read More
In the process of grinding a marble floor. I am getting a lot of the corners of the marble cracking. Why is this happening?
Viewed 531 times since Wed, Sep 5, 2012
The marble tile was most likely improperly installed. Before you grind a floor you should sound the floor by tapping on each tile with a broom handle. If you hear a hollow thud sound then there is a strong chance that the tile has no setting material... Read More
My customer’s shower floor is made of a flamed granite. A hard white deposit is starting to form between the grout lines. What is this, and what is the best way to clean it?
Viewed 530 times since Wed, Sep 5, 2012
The hard white deposit is a build-up of salts. These salts known in the tile industry as "lime putty" are coming up from the setting bed, and can be very difficult to remove. To remove lime putty, scrape away as much of it as possible using a putty... Read More
My bathroom marble floor is very slippery when I get out of the shower. Is there any treatment I can put on the floor to keep it from getting slippery?
Viewed 530 times since Wed, Sep 5, 2012
Although there are several coatings that will provide added slip resistance, there is, unfortunately, a trade-off. Coating the stone will increase maintenance requirements, but if safety is an issue, it's worth considering. Contact a stone... Read More
Will I need to apply more impregnator to a honed stone than a polished stone?
Viewed 530 times since Wed, Sep 5, 2012
A honed surface will usually require more sealer than the a polished surface. Honed and textured surfaces are more porous since the pores of the stone are more open than a polished stone. TIP: You will also discover that granite is more porous than... Read More
Is it true that all marble has veins and granites do not? Is this a good way to tell the difference between the two?
Viewed 529 times since Wed, Sep 5, 2012
No, it is not true. Many marbles do have veins, but there are some that appear to have no veins at all. On the other hand many granites have no veins but there are also those that do have veins. Determining if a stone is marble or granite should not... Read More
I have a customer who has a ceramic tile floor that has lost its glaze. Is there a process available to restore the glaze, or do they have to replace the floor?
Viewed 529 times since Wed, Sep 5, 2012
At this time there is no process that can fully restore the glaze to a ceramic tile floor. The glaze on ceramic tile is achieved by baking the tile at very high temperatures which cannot be achieved after installation. There are, however, a number of... Read More
I have a maintenance account that has twelve men’s restrooms that all contain a white Italian marble. There is a constant problem with urine stains at the base of all the urinals. What, if anything, can I apply to the marble to keep it from sta
Viewed 529 times since Wed, Sep 5, 2012
There are numerous products on the market that will repel water and oil. Unfortunately urine is an acid and currently there is no product on the market that will repel acid. My advice would be to apply a good quality oil-repellent impregnator and to... Read More
I am working on a marble floor that has brass strip in place of the grout. Can I hone and polish this floor without removing the brass?
Viewed 527 times since Wed, Sep 5, 2012
Yes, the brass will hone and polish just like the marble. Don't be surprises if the brass strips are polished to a mirror shine. Brass can however leave a greenish color stain on the marble. If this occurs it will be necessary to poultice the stain... Read More
I have been told that stone flooring is called non-resilient. What is the difference between resilient and non-resilient flooring?
Viewed 527 times since Wed, Sep 5, 2012
Resilient flooring or tile is material that will return to its original shape after it has been compressed or stepped on. Examples of resilient floors are vinyl, rubber, cork, asbestos and linoleum. Stone, quarry tile, terrazzo, ceramic, and concrete... Read More
Is it safe to use an acid to clean a flamed finish granite?
Viewed 526 times since Wed, Sep 5, 2012
All acids should be used with caution on any stone surfaces. Granite is one stone type where most acids will not harm it. However, stay away from hydrochloric acid (HCL). HCL can deposit salts in the granites pores if not rinsed throughly. I would... Read More
Here is a question my customer is asking: "We installed a stone floor in my son’s nursery. Because of his allergies, we have been told to clean the floor with a disinfectant. What can we use that will disinfect without ruining the high pol
Viewed 526 times since Wed, Sep 5, 2012
I suggest you contact a local janitorial supply house and tell them you need a disinfectant with a neutral pH. There are several dozen on the market that will do an excellent job. It will be very important to dust mop the floor as much as possible.... Read More
I have been told that I have a class D marble, which is very brittle. What does this mean?
Viewed 525 times since Wed, Sep 5, 2012
The Marble Institute of America has developed four classifications for marble. This classification system is based on how sound the material is. A class A marble would be the the most sound where as a class D marble is very weak. The following is a... Read More
I am trying to fill a travertine floor with colored grout and am having trouble getting it to dry. Is there any thing I can add to the grout to get it dry faster?
Viewed 525 times since Wed, Sep 5, 2012
You bet. Cream of tartar can be added to the grout mixture which will make it dry faster. (That's right, it is the same creme of tartar that you buy at the grocery store.) TIP: There are several pre-packaged mixtures that are designed to fill... Read More
I have a customer with a black granite kitchen counter top. The top is getting glass rings and appears to be fading and loosing its color. What is happening?
Viewed 524 times since Wed, Sep 5, 2012
This is common problem with a lot of black granite tops that have been fabricated in India and China. The tops are doctored by using wax, linseed oil etc. As the counter is cleaned the waxes and oils are being removed. The only solution is to polish... Read More
Is it safe to use household bleach on my white marble floor?
Viewed 524 times since Wed, Sep 5, 2012
I would not recommend using bleach on any marble floor as a daily cleaner. Household bleach can cause staining on certain types of marble. Use only a good stone soap or neutral cleaner. TIP: Occasionally you will see bleach recommended for removing... Read More
How can I clean the black soot off my marble fireplace hearth?
Viewed 524 times since Wed, Sep 5, 2012
Several products are designed specifically for cleaning soot and carbon build-up from marble. Contact your marble supply house. Be sure the product is not an acid; apply it per the manufacturer's directions and allow it to sit on the marble for 10 Read More
Is it OK to use a vacuum cleaner on my marble floors?
Viewed 524 times since Wed, Sep 5, 2012
Yes and no. A vacuum cleaner can be an excellent tool for eliminating dust and dirt, but you must be sure that it will not scratch the marble. Check the bottom of the vac and make sure there will be no metal rubbing on the stone as you move it back... Read More
My customer was told that their deteriorating marble building should have a consolidant applied. What is a consolidant and how does it work?
Viewed 524 times since Wed, Sep 5, 2012
Consolidants are materials applied to masonry and stone that bind the loose minerals of the stone or masonry together. Consolidants are used on stone that has been severely weathered and have lost there naturally binding materials. The most common... Read More
Can stone soap and neutral cleaner be used on granite surfaces the same way as they are used on marble?
Viewed 522 times since Wed, Sep 5, 2012
Yes, both stone soaps and neutral cleaners will work for cleaning and maintaining granite surfaces. Stone soaps can build up on the surface of stone if overused. Carefully follow the directions on the bottle. Use only cold to warm water. Do not use... Read More
My customer just had a new green marble foyer installed. The problem they have is that is that the tiles are curling up on the corners. Why is this occurring, and can it be corrected?
Viewed 522 times since Wed, Sep 5, 2012
Curling in green marble can be a serious problem when the marble is set in a wet mud or thin-set. The Marble Institute of America recommends that green marble be set with an epoxy-based compound. Check with the installer and see what has been used to... Read More
I have a customer with a marble tile kitchen floor that has several chipped tiles. Replacement tiles are no longer available. What is the best way to repair?
Viewed 519 times since Wed, Sep 5, 2012
To repair chips in marble tiles use a polyester resin and color match to the existing material. If the chip is shallow the polyester may not stick. It may be necessary to make the chip bigger. Read More
The slate steps on my client’s front porch have developed a hard white deposit coming from the grout lines. How can I clean it off?
Viewed 519 times since Wed, Sep 5, 2012
The white deposits are salts, which are bleeding through from the grout joints or from the mortar. An acid wash will be required to remove the salts. If the deposits are heavy, try scraping them off before washing the slate with acid. Several acid... Read More
I just looked at a marble floor that had some type of a wax on it. There appears to be a blotchy appearance as if something is coming up from the marble and just under neath the wax. What is this?
Viewed 518 times since Wed, Sep 5, 2012
It sounds like moisture is trying to escape from the marble. This is a problem if a non breathable coating is placed on the marble. You will need to strip the coating off the floor and allow it to dry for several days. I would suggest polishing the... Read More
Which machine is best to hone and polish granite, single disk buffer or a large Planatary head machine?
Viewed 518 times since Wed, Sep 5, 2012
The larger, heavier machines are much faster at grinding, honing and polishing granite. The large grinders work well but many companies do not have access to them. Many of them also require 220 volts which can be difficult to get in certain... Read More
Someone told me I could use car wax on my granite vanity top. Is this true? If not, what should I use to protect it and keep the shine?
Viewed 518 times since Wed, Sep 5, 2012
Most of the marble and stone polishes on the market contain the same type of wax found in everyday car wax. However, I would be cautious about applying car wax to a stone counter top; the newer car waxes contain colorants which could stain the stone.... Read More
Is there an easy way to remove steel wool dust from a marble floor after I recrystallize?
Viewed 517 times since Wed, Sep 5, 2012
You can use what is called a magnetic broom. This is a long magnetic with two wheels on each side that are attached to a broom handle. Since steel wool is a magnetic metal the magnetic will effectively pick up the steel wool fibers. These brooms can... Read More
How much material am I removing every time I hone a stone floor?
Viewed 517 times since Wed, Sep 5, 2012
This will depend on what grit you are using. Recent studies performed by several abrasive companies have shown that honing of marble removes the following amount of material: Grit size Average amount removed(inches) 120 .0019 400 .0008 800 .0001 1800... Read More
How do I clean the grout lines after polishing? The grout is black and the white powder residue is difficult to remove.
Viewed 516 times since Wed, Sep 5, 2012
There are several ways to remove this residue. First try using a solution of stone soap and warm water. Apply this solution with a string mop and pick up with a wet vacuum. Next time you polish granite with black grout lines add a small amount of... Read More
What is the best material for protecting walls from the marble slurry created when honing?
Viewed 515 times since Wed, Sep 5, 2012
There are several materials that can be used. Plastic sheeting and drop cloths can be used. Several contractors I know use waxed butcher paper. There is also a material that has tape already attached to it and is available in a rolled dispenser. Any... Read More
Do you have a secret formula for a granite polishing powder?
Viewed 514 times since Wed, Sep 5, 2012
I don't know if I'd call it a secret formula but the following granite polish formula should prove effective on most granite. To one pound of tin oxide powder add 5 teaspoons of black oxide powder, 4 teaspoons of sulfur dioxide and 3 teaspoons of... Read More
My customer’s marble vanity top continually gets small chips along its edges. What is the best solution?
Viewed 514 times since Wed, Sep 5, 2012
You may want to recommend to your customer that having the edges rounded would help prevent further chipping. The edge can be rounded using a course diamond abrasive on a small electric hand machine. You can also put a profile on the edge using a... Read More
We tell our customers to avoid using acid based toilet bowl cleaners, but what can they use instead? I frequently find marble floors that are being ruined by acid cleaners.
Viewed 514 times since Wed, Sep 5, 2012
StonecareCentral.com as well as many janitorial supply stores carry non-acid bowl cleaners. Most bathroom cleaners also contain acids and these should be avoided around marble. TIP: Household bleach also makes a good toilet bowl cleaner and should... Read More
Would you recommend applying a solvent based impregnator to a Historic limestone building?
Viewed 514 times since Wed, Sep 5, 2012
That's a difficult question to answer. First you need to make a determination as to whether the building needs this kind of protection. Second there are numerous environmental conditions that need to be assessed before you make that decision.... Read More
I accidentally splashed marble slurry on a stainless steel elevator door. I tried wiping it off with water and a neutral cleaner and when it dried there was still a film on it. Help?
Viewed 513 times since Wed, Sep 5, 2012
Try using a solution of stone soap and warm water. Rinse several times and wipe dry with a terry cloth towel. This should remove the film. This procedure also works well on wood and Formica surfaces. CAUTION: Many metal surfaces contain a lacquered... Read More
I have a granite kitchen counter top that is uneven. The top is made up of two slabs. The slabs are uneven where they join at the grout line. Can I grind the slab and even it out and more importantly can I match the existing shine?
Viewed 513 times since Wed, Sep 5, 2012
You can grind the uneven counter flat but, I would first check to see why the slabs are uneven. It is possible that the plywood under the slabs has shifted or the granite was installed uneven. Check to make sure the slabs are secure. After the... Read More
Can I skip a grit when honing granite, and if I do will this affect the final polish?
Viewed 513 times since Wed, Sep 5, 2012
Do not skip any grits when honing granite. This is extremely important since the honing and polishing of granite relies on smoothing the stone. Each and every step is important and should not be skipped. If you do skip a step you may not achieve an... Read More
This has come up several times and I’d like to know what to tell my customers. Is it safe for my customers to use pine-type cleaners on their marble floors? How about a ceramic tile floor?
Viewed 513 times since Wed, Sep 5, 2012
Pine-type cleaners are not recommended for polished stone surfaces . They contain harsh chemicals that can etch the stone. However, they work well, and are safe to use on ceramic tile. TIP: Let your customers know that few grocery stores carry... Read More
Our green marble floor has never looked very shiny in comparison with the black marble in our bathroom. Can it somehow be given a very deep shine like the other marble?
Viewed 513 times since Wed, Sep 5, 2012
It depends on what kind of green marble you have. I would guess that the green marble in your bathroom is an Asian green. If this is the case, you will never get a deep shine on this marble. These stones characteristically have a clouded shine. If,... Read More
I have a granite panel wall that has some kind of coating on it. Methylene chloride is the only thing that takes it off. Is there any other chemical that might work?
Viewed 512 times since Wed, Sep 5, 2012
Yes, there are several chemicals now available that are as effective as methylene chloride. They are known as non-methylene chloride strippers or safety strippers. These alternative strippers work very well but are much slower than methylene chloride... Read More
I ground an agglomerate tile floor and it has all these tiny pin holes in it. I can’t find anything to fill these pin holes. Any suggestions?
Viewed 511 times since Wed, Sep 5, 2012
Some agglomerate tiles are poorly manufactured and will have tiny air holes which open up when ground. This most likely what happened in this case. These tiny holes are so small that it is difficult to get grout and polyester to flow into them. To... Read More
How should I advise my customers to remove the soap scum off their marble and tile shower walls?
Viewed 511 times since Wed, Sep 5, 2012
Several products are available at the grocery store for removing soap scum, but they most likely are not safe for natural stone. Most soap scum removers contain acids which should not be used on marble surfaces. These cleaners work well on ceramic... Read More
My Mexican tile floor turns a cloudy white whenever I spill water on it. What’s causing this, and can it be fixed?
Viewed 511 times since Wed, Sep 5, 2012
This cloudy-white condition is common on tiles that have been coated with an acrylic wax. Consider having the floor stripped and re-coated with a good-quality Mexican tile sealer. TIP: Mexican tile is a clay product and is extremely soft and very... Read More
Is there any way to prevent hard-water spots from forming on our ceramic tile shower walls?
Viewed 511 times since Wed, Sep 5, 2012
The water spots are, of course, literally caused by the hard water. Here's a trick you can try. Spray on some Stonecare PRO Signature Stone Conditioning Treatment. It can be applied to the tile to help prevent them from forming. A vinegar and-water... Read More
How do I repair cracks in terrazzo?
Viewed 510 times since Wed, Sep 5, 2012
Small cracks in a terrazzo floor can be repairs as follows: Clean the crack with acetone, making sure to remove all dirt, old wax and other debris. A dental pick is helpful in removing old wax buildup. After the crack is cleaned you will notice that... Read More
I tried honing and polishing a granite tile that had been sandblasted. When I polished, it had a spotting appearance. Did I do something wrong?
Viewed 510 times since Wed, Sep 5, 2012
No, you didn't do anything wrong. When granite is sandblasted the force of the abrasive destroys the crystal structure of the granite. This is why you are seeing a blotchy appearance. Unfortunately the damage has been done and there is very little... Read More
My granite vanity top has gold/brass fixtures. What can I use to clean the granite without damaging the fixtures?
Viewed 510 times since Wed, Sep 5, 2012
For daily and light cleaning, use a good stone soap, which will not harm the gold or brass fixtures. For heavier-duty cleaning, remove the fixtures or protect them with masking tape. Be careful when using acidic cleaners, since acids will tarnish the... Read More
What is the best pad to use for powder polishing? White? Hogs hair?
Viewed 509 times since Wed, Sep 5, 2012
There are many pads that can be used to polish marble. The choice of pad depends on your level of experience. Many experienced craftsman prefer to use a hogs hair, or what is known as a burnishing pad. My advice would be to try several and use what... Read More
I just completed polishing a granite floor. It turned out great except for one problemthe floor is very slippery. Is there any way I can make the floor less slippery?
Viewed 509 times since Wed, Sep 5, 2012
There are several treatments that can be applied to give the granite more slip resistance or you can apply an slip resistance acrylic coating. Slip resistance treatments contain hydrofluoric acid which etches the surface of the stone. The treatment... Read More
We have been in our new house for three months and are starting to see cracks developing in the marble floor. The contractor told us these were "settling cracks." Will this continue to be a problem? Can the cracks be repaired, or should we
Viewed 509 times since Wed, Sep 5, 2012
Settling cracks are common in newly constructed homes. These cracks may continue to develop for over a year. I would suggest replacing the tiles after approximately one year, or until the settling subsides. Be sure to purchase extra tiles and now is... Read More
Any tips for removing etch marks from a marble shower wall? My customer’s maid used an acid cleaner on them and it left some deep marks.
Viewed 509 times since Wed, Sep 5, 2012
Since the acid has etched the marble, the etching will require honing and polishing to remove. TIP Etch marks caused by acid bathroom cleaner can penetrate very deep in some stone. To remove them may require grinding with a 60 grit diamond. This is... Read More
Do I have to use diamonds to hone marble? Are there any alternative materials?
Viewed 508 times since Wed, Sep 5, 2012
Diamonds are the most popular abrasive for honing marble but are not the only abrasive. Alternative abrasives are as follows: SCREENS - Screens are silicon carbide mesh that can be used dry or wet. The disadvantage with screens is that they wear very... Read More
I have been poulticing a rust stain for several applications on a marble floor. Every time I remove the poultice the stain seems to be darker and more wide-spread. What is happening?
Viewed 508 times since Wed, Sep 5, 2012
Chances are the source of the rust is under the tile. A nail or metal object may have been left behind when the tile was installed. The reason the rust gets darker is because you are pulling the rust from the bottom of the stone to the top. I would... Read More
How large of a test patch should I do to determine if the method selected will work?
Viewed 507 times since Wed, Sep 5, 2012
Test patches should be large enough to give you a representative sample of the work. If you are going to hone and polish a floor I would use at least a four foot by four foot area. Avoid very small test areas. Also make sure your test patch is done... Read More
My customers live in a very sandy area, and the sand is severely scratching their marble floor. Any suggestions as to how they can keep the sand from getting on the floor?
Viewed 507 times since Wed, Sep 5, 2012
Unfortunately, there is nothing you can put on the floor that will prevent it from scratching. You may find it useful to place several walk-off mats, both inside and outside the entrances, to help trap most of the sand. Dust-mopping the floor as... Read More
If I apply an impregnator to the back of a tile before setting, will this cause a bonding problem?
Viewed 507 times since Wed, Sep 5, 2012
Yes it may cause a bonding problem. Since most setting mortars are water based they will want to repel the water. I would suggest using an epoxy type setting material. TIP: Before setting any stone tile check to make sure that it has not been sealed.... Read More
Is there an alternative method for maintaining a terrazzo floor besides waxing and stripping?
Viewed 506 times since Wed, Sep 5, 2012
Terrazzo is over 75% marble chips and therefore can be maintained the same way as marble. Hone the terrazzo floor to at least a 400 grit and then polish with a marble polishing powder. The terrazzo can be maintained with powder or it can be... Read More
I am having a lot of trouble trying to match the color on a norweign rose marble. The stone has a lot of chips that I need to fill and I can’t seem to get the color matched. Do you have any helpful hints?
Viewed 506 times since Wed, Sep 5, 2012
You are probably using a white or buff colored polyester. These colored polyesters are hard to color since they have a bright translucent hue. The best polyester to use would be a transparent type. To mix the proper color you can purchase artists oil... Read More
I have a customer with a granite floor that has just been installed and the installer left a grout film all over the surface . What can I use to remove this film?
Viewed 506 times since Wed, Sep 5, 2012
The best cleaner to use for removing grout residue from a granite floor is sulfamic acid. Sulfamic acid is sold as a grout cleaner and works well on granite surfaces. Do not use on marble or limestone since the acid will etch these surfaces. Sulfamic... Read More
Is it possible to darken a honed granite without polishing? My customer wants the granite to remain honed but would like the color it has when polished.
Viewed 506 times since Wed, Sep 5, 2012
Yes, you can darken the granite by applying a special darkening sealer. These are known as color enhances and can be purchased at stone equipment and maintenance suppliers. You can also use the mixture of boiled linseed oil and mineral spirits. Start... Read More
Can an impregnator be used to waterproof stone?
Viewed 506 times since Wed, Sep 5, 2012
No. Be careful, the idea of an impregnator is to make the stone water resistant, not waterproof. In order to make the stone waterproof we would need to completely block the pores of the stone. If this is desired I would recommend a topical coating.... Read More
Can a marble floor be flamed like a granite floor?
Viewed 505 times since Wed, Sep 5, 2012
No. Most marble, with the exception of certain limestones, cannot be flamed. The mineral make up of marble will not allow the surface to become flamed. Trying to do so will only burn the surface. FYI: If you come across an unknown stone surface and... Read More
Will an impregnator turn a limestone floor dark?
Viewed 505 times since Wed, Sep 5, 2012
All impregnators should be tested first in an inconspicuous area. We have found that certain limestones and an occasional granite will become permanently dark. Apply the impregnator and wait at least 24 hours before making a determination as to... Read More
Is there any way to remove (imregnator) sealer from the stone?
Viewed 504 times since Wed, Sep 5, 2012
There is no effective way to remove one hundred percent of the sealer. Solvents such as mineral spirits, methylene chloride and others can be used to remove the sealer from the surface to a few millimeters below the surface. These solvents have to be... Read More
If I apply impregnator to a stone that has a stain on it, can I remove the stain after I seal?
Viewed 503 times since Wed, Sep 5, 2012
Chances are that you have sealed the stain into the stone permanently. You may be able to remove it using very strong solvents such as methylene chloride to remove the sealer than attempting a poultice on the stain. Good luck, this is a tough one.... Read More
How long should I work each diamond grit when honing granite? I have been told to work each grit at least one minute per square feet. Is that long enough?
Viewed 502 times since Wed, Sep 5, 2012
Unfortunately there is no formula for how long each grit should be worked except that granite requires much longer to hone then marble. Generally one minute per square foot is a good starting point. However, some granites may take longer. It is not... Read More
After I finished grinding a marble floor with a 120 grit I noticed that the is grout missing. Can I replace the missing grout without removing all the grout? How do I match the color of the existing grout?
Viewed 502 times since Wed, Sep 5, 2012
Yes, you can replace the missing grout. Be sure to use only unsanded grout . You will also need to wait 24 hours before proceeding with honing or you can wait until you have polished the floor and then replace the grout. Matching the color of the... Read More
Once I remove a stain, what are the chances of it coming back?
Viewed 501 times since Wed, Sep 5, 2012
It may come back, depending on how deep the stain is or what caused the stain in the first place. If the stain is coming from behind the stone, chances are it may come back. If this is the case and the stain reappears I would replace the stone if... Read More
How do I apply an impregnator to a vertical wall surface?
Viewed 500 times since Wed, Sep 5, 2012
The best way to apply to a vertical wall is to use a roller, cloth or lambs wool applicator. Thoroughly saturate the applicator in sealer and apply to wall from the bottom up. Continue to apply making sure to thoroughly saturate the surface. This may... Read More
How do I keep the grout on my ceramic kitchen counters clean? It seems to be a never-ending battle.
Viewed 499 times since Wed, Sep 5, 2012
Several grout cleaners are available at your home center, hardware store or janitorial supply store. These cleaners are acidic, so caution is advised. Once the grout is cleaned I would suggest applying a good grout sealer. You may also want to... Read More
Can a stone be re-polished once it has been sealed with an impregnator?
Viewed 499 times since Wed, Sep 5, 2012
Yes, since polishing effects the surface of the stone only, polishing will not be effected. After polishing be sure to check the surface of the stone by performing an absorbency test. If the original impregnator was applied sparingly it is possible... Read More
I recently recrystallized a white thassos marble floor and two days after I completed the job the floor turned yellow. Did I do something wrong and how do I correct this?
Viewed 498 times since Wed, Sep 5, 2012
For some reason white thassos marble is very sensitive to the recrystallization process and quite often it will turn yellow. It may be that you applied the recrystallization too soon after honing. Recrystallization should only be performed on marble... Read More
I have been using a stone soap on a marble floor and it is getting sticky, should I switch to another cleaner?
Viewed 498 times since Wed, Sep 5, 2012
Sounds like you are using too much stone soap. Stone soaps, if overused, will build up on the surface of the floor and will become sticky. To remove this stickiness, clean the floor with plain water. It may require several moppings to remove. You can... Read More
I just honed a travertine floor and it has all these very tiny pin holes. Knife grade and the flowing grade polyesters will not fill in the holes. Do you know something that will?
Viewed 498 times since Wed, Sep 5, 2012
These tiny holes are a common problem with not only travertine but can also occur on agglomerates. The best way to fill these is with what is known as a penetrating glue. This is water thin polyester that will flow into these holes. TIP: Filling tiny... Read More
I have a cleaning service. My client has a white marble vanity top in their master bathroom. It tends to develop white dull spots. What can I do to remove them?
Viewed 498 times since Wed, Sep 5, 2012
These white dull spots are probably etch marks caused by cosmetics, shaving lotion, etc. To remove them, the vanity will have to be polished, and, depending on the severity of the etch, possibly honed. I would recommend calling a stone professional,... Read More
The Mexican tile floor on my back porch is turning yellow. Help?
Viewed 498 times since Wed, Sep 5, 2012
First, has the tile been sealed? There are several urethane coatings on the market that are used to coat Mexican tile. These urethanes are sensitive to ultraviolet (UV) light and will turn yellow. Strip the floor and apply a Mexican tile sealer.... Read More
I am trying to hone a saturnia tile floor and it is chewing up my diamonds, any suggestions?
Viewed 497 times since Wed, Sep 5, 2012
What diamonds are you using? Resin bond diamonds will not last on a saturnia floor. I would recommend using metal bond diamonds, bricks or even screens. Saturnia is a very abrasive stone and will require very abrasive pads. TIP: Saturnia is nothing... Read More
I am looking to purchase a single disc floor machine. Besides speed what else should I be looking for?
Viewed 497 times since Wed, Sep 5, 2012
Marble honing and polishing can be very hard on a floor machine. For this reason I would purchase a commercial heavy duty machine. A heavy duty machine would be at least a 1 Read More
I have a maintenance account with a large building and have noticed that the granite on the outside of their building is crumbling and falling apart. This condition is getting worst every year especially during the spring months. What’s causing
Viewed 497 times since Wed, Sep 5, 2012
This is a problem in northern climates where de-icing salts are used. During the winter months deicing salts are used to melt the snow and ice. When the weather warms, the salts are dissolved and carried into the granite. When the granite dries, the... Read More
Do you have a good tip I can pass on to my customer for how to prevent their dining room chairs from scratching their marble floor?
Viewed 497 times since Wed, Sep 5, 2012
The chair legs need to have plastic or cloth felt protectors attached to them. These protectors are small square or round tabs that are designed to prevent scratching. They are available at most hardware and home supply centers. TIP: If you cannot... Read More
My customer just had their floors polished by another company. Now it is turning yellow and they’ve called me in to fix the problem. What should I know about this?
Viewed 496 times since Wed, Sep 5, 2012
It sounds like the floor was still wet and was crystallized. You will have to re-polish the floor with polishing powder to remove the yellowing, and if you plan to use the recrystallization process again, the floor will have to be allowed to dry for... Read More
Is a 300 rpm machine faster or better than a 175 rpm machine for honing and polishing marble?
Viewed 495 times since Wed, Sep 5, 2012
Both the 175 and 300 rpm machine will get the job done, however it is being discovered that the faster speeds perform faster and do provide a better finish. Stay tuned, you may also start seeing machines faster than 300 being used for marble honing... Read More
I am polishing a black marble floor and am having trouble with the grout lines. The polishing powder is leaving a white residue in the black grout lines and it is difficult to clean them. Do you have any suggestions?
Viewed 494 times since Wed, Sep 5, 2012
There are several ways to eliminate the white residue in the black grout lines. First you may want to add a stone soap to your rinse water. Stone soap will clean the grout lines. If this proves ineffective you can add a small amount of black dye to... Read More
I have been asked to hone a polished marble floor. At what grit is it considered honed?
Viewed 493 times since Wed, Sep 5, 2012
There is no standard grit size that determines when marble is honed. Generally a 120 or 400 grit is honed, but this will vary from marble to marble. Perform several test patches and determine which grit will give you or your customer the appearance... Read More
Can I stop at the 400 grit and polish granite like I do with marble?
Viewed 492 times since Wed, Sep 5, 2012
Unfortunately granite doesn't react like marble. It will be necessary to proceed all the way to the last grit before polishing. Marble can be polished from the 400 grit due to the fact that it reacts with oxalic acid. Granite does not react with acid... Read More
Here’s a question my customer has asked and I don’t quite know how to answer. "Every time it rains, a blotchy light-and-dark stain appears on my granite sidewalk. If it stays dry for several weeks, it goes away. What is happening, an
Viewed 492 times since Wed, Sep 5, 2012
Most granite is very absorbent, and will soak up a large quantity of water. What your customer is seeing is moisture in the granite, which can take anywhere from several days to several months to dry out. Once the granite dries apply a penetrating... Read More
I was called to remove a heavy wax coating on a granite floor. I’ve discovered that the janitorial company has been stripping and waxing this floor for several years. The problem is the granite is developing small pits and appears to be falling
Viewed 491 times since Wed, Sep 5, 2012
The problem may be with the strippers that have been used. Many strippers have an alkaline pH and this can lead to the deposit of alkaline salts in the pores of the granite. If the stripper is not rinsed throughly and any stripper residue is left... Read More
When I remove the poultice there seems to be a ring or halo around the stained area. How do I remove it?
Viewed 491 times since Wed, Sep 5, 2012
The halo or ring is usually caused by remaining residue of poultice. Try cleaning the halo area with the chemical you used in the poultice and be sure to rinse with plenty of water. If this does not remove the halo or ring it is possible that the... Read More
The silicon caulking around my granite shower wall seems to be staining the granite. Is there a way to remove this stain?
Viewed 490 times since Wed, Sep 5, 2012
Staining from silicon can be very difficult to remove, but not impossible. First remove all the silicone caulking; removal of the stain will require the application of a poultice and a strong solvent such as methylene chloride. Several applications... Read More
The granite in my master bath shower is pitting and feels very rough. What is causing this, and can it be fixed?
Viewed 490 times since Wed, Sep 5, 2012
There are several possible causes for the pitting. Improper cleaning chemicals and salt deposits can contribute to this condition. Depending on the severity of the pitting, replacement may be necessary. TIP: Pitting of granite in this situation is... Read More
What type of dust mop should I recommend that my customers use on their marble floors? I was told to stay away from treated dust mops.
Viewed 489 times since Wed, Sep 5, 2012
The advice you received was correct. Most treated dust mops are treated with an oil-based chemical. Certain stones can absorb this oil, causing staining. Strongly recommend only untreated dust mops. TIP: Also, tell your customers this: When... Read More
How can I tell if a sealer is no longer working?
Viewed 489 times since Wed, Sep 5, 2012
The best way to tell is to perform an absorbency test as follows: Take a drop or two of water and place it on the surface of the stone. Record the time it takes to soak into the stone. If the water soaks into the stone in under five minutes, the... Read More
Our terrazzo floor has had many coats of wax applied to it over the years. The wax build-up on the terrazzo baseboards is very thick and difficult to remove. Do you have any suggestions?
Viewed 488 times since Wed, Sep 5, 2012
Wax build-up on a vertical surface can be difficult to remove, since most strippers will run. Janitorial supply stores do offer spray-on baseboard wax removers that work very well; since they are applied as a foam, they will cling to vertical... Read More
We recently removed a large carpet from a terrazzo floor. Under the carpet was a large yellowed area the shape of the carpet. How do we remove this yellow stain?
Viewed 488 times since Wed, Sep 5, 2012
This is common problem with carpets that have jute or rubber backings. Moisture becomes trapped under the carpet and causes the dye in the backing to bleed into the terrazzo. To remove the yellowing clean the area throughly with a good detergent than... Read More
Can a impregnator be over-applied?
Viewed 486 times since Wed, Sep 5, 2012
Yes. To properly apply an impregnator it is important that the stone is thoroughly saturated with sealer. If too much sealer is applied it will puddle on the surface. This excess should be removed, otherwise it will dry and form a sticky residue. If... Read More
If I seal a stone with an impregnator and it somehow becomes stained, will a poultice work?
Viewed 485 times since Wed, Sep 5, 2012
Yes, it should work as long as the stain occurred after the stone was sealed. If the stain was present before the sealer was applied there is a good chance that the stain will be sealed into the stone making removal difficult. If this is the case the... Read More
What’s the difference between powder polishing and recrystallization?
Viewed 484 times since Wed, Sep 5, 2012
To answer this question throughly would require several pages. I would suggest you attend a formal training program to find out more about these differences. The restoration courses provided by The Stone and Tile School cover this very well. I will... Read More
Which granites are harder, black, red or salt/peppers?
Viewed 480 times since Wed, Sep 5, 2012
There are many types of granites. The black granites are generally softer than others. The granites that wear easily are much softer then those that appear to last forever. FYI: There are many types of granites and some fall into a category... Read More
My customer has mentioned that when she walks across her marble floor wearing heels, she can hear a hollow sound under several tiles and wants to know if this is normal, or should she be concerned?
Viewed 480 times since Wed, Sep 5, 2012
You should have a professional installer check the installation for soundness. It may have not been installed properly. The hollow sounding tiles is an indication that areas under the tile are not in contact with the setting bed. These hollow areas... Read More
Can a polyester patching material be used to repair stone on an exterior?
Viewed 478 times since Wed, Sep 5, 2012
Polyester resins breakdown in the presence of ultra violet(UV) light. For this reason polyesters should never be used outdoors. For outside repairs it is advisable to use an epoxy resin. Epoxy resins are generally more resistant to UV light. Check... Read More
My customer’s granite tile floor has developed several white streaks. They’ve tried several things but they don’t seem to go away. What can I suggest they use to clean them off?
Viewed 477 times since Wed, Sep 5, 2012
These white streaks may be hard-water deposits, which can prove very difficult to remove. Suggest that they try a sulfamic acid-based tile-and-grout cleaner such as Stonecare PRO Signature's HEAVY DUTY Tile and Grout Cleaner (www.stonecarecentralpro... Read More
Once I have applied a silicon impregnator to a stone and I decided later that I want to apply a coating. Will the coating adhere to the stone?
Viewed 477 times since Wed, Sep 5, 2012
Probably not. If the coating is water based it may have difficulty bonding - it may peel off. I would recommend using a coating that has a solvent base if a coating is desired. TIP: Before applying any coating to a stone surface it is important to... Read More
I tried to hone a marble floor and after the 600 grit I keep getting stray scratches. Where are these scratches coming from?
Viewed 476 times since Wed, Sep 5, 2012
There are several reasons you may be getting stray scratching check the following: Do the grout joints contain sanded grout? If the grout joint is wider than 1/8 inch, the chances are you have sanded grout. If you do, then the grout is becoming... Read More
What is the best way to remove chewing gum from a flamed granite sidewalk?
Viewed 476 times since Wed, Sep 5, 2012
You can remove chewing gum by freezing it. Place ice cubes, or, if available, dry ice on top of the gum. The gum will freeze hard, and can easily be popped off the granite. You can also buy a product at your local janitorial supply called "gum freeze... Read More
What do I tell my customers when they ask if an impregnator is safe to be used on a kitchen counter top?
Viewed 475 times since Wed, Sep 5, 2012
Tell, them that it is completely safe. According to a report by the USDA, once the sealer cures it is safe to use in food areas. I would wait approximately 24 hours after application before I would use in food in the area to allow for the solvents to... Read More
I have just finished grinding a marble floor. How long do I have to wait before applying impregnator?
Viewed 475 times since Wed, Sep 5, 2012
You need to wait until the stone is completely dry. The average time is about 24 hours depending on temperature and humidity. This is very important since applying an impregnator to a wet floor may cause spotting and shading. The wet areas of the... Read More
What’s the best answer to give my customer when they ask how often they should have their marble floors professionally polished?
Viewed 474 times since Wed, Sep 5, 2012
That's a difficult question, since it depends on the type of marble, how hard or soft it is, how much traffic the floor receives, and many other factors. On the average, most marble floors in a home need to be polished about once every one or two... Read More
Which is harder, marble or granite?
Viewed 473 times since Wed, Sep 5, 2012
Granite is much harder than marble. The hardness of stone is measured on a scale of 1 to 10. Ten is the hardest mineral. Diamond is a ten. Most marbles fall in the 3-5 range and granites fall into the 7-8 range. A simple test to determine if you are... Read More
Can I speed up the drying time of impregnator?
Viewed 471 times since Wed, Sep 5, 2012
Several fans place on the stone will help speed up the drying and curing time. Turning the air conditioner down low will also help speed the drying process. Regardless of the drying time, most impregantors will continue to cure for a period of seven... Read More
Is granite more porous than marble?
Viewed 470 times since Wed, Sep 5, 2012
Yes, granite is more porous then marble. The pores in granite are generally much larger than marble and therefore will absorb more water. For this reason it is absolutely necessary to apply an impregnating sealer to granite. FYI: Most people consider... Read More
My customer has a new marble floor that has a white powder on it. It cleans up with water and soap, but keeps coming back. Is there anything I can use to clean it off permanently?
Viewed 470 times since Wed, Sep 5, 2012
This a common condition, especially if the floor is new. When the marble is installed, it is set in a mortar base that is wet; as the moisture leaves the mortar, it carries with it dissolved salts which are deposited on the surface of the stone. This... Read More
Once I seal a stone with an impregnator how long will it last and when do I need to reapply?
Viewed 470 times since Wed, Sep 5, 2012
Generally most impregnators will last several years under normal conditions. If the stone will be re-honed or re polished I would recommend reapplying. TIP To test if the impregnator is working perform the following test: Place several drops of water... Read More
We have a marble bathroom floor and keep getting spots around the toilet. Is there any sealer we can place on the marble to prevent this spotting?
Viewed 469 times since Wed, Sep 5, 2012
The spotting can be caused by dripping toilet bowl cleaners, which can etch the marble surface. As of this writing there are no sealers that will prevent acid etching. I would suggest purchasing a non-acidic bathroom bowl cleaner, available at most... Read More
I am having trouble polishing an unfilled travertine wall. I am using polishing powder and it is accumulating in the pores of the travertine. Is there a better way?
Viewed 467 times since Wed, Sep 5, 2012
Yes there is. You can polish a travertine wall with a solution of "charged water." Charged water is a mixture of oxalic acid and water. Mix approximately one pound of oxalic acid to one gallon of water. Take this mixture and transfer it to a spray... Read More
My customer wants to know if it is safe to use a vegetable oil-based cleaner on their marble floor. What should I tell them?
Viewed 465 times since Wed, Sep 5, 2012
Most of the stone soap products sold by stone care suppliers contain vegetable oil-based soap, and are safe for marble surfaces. However, a good quality pH neutral cleaner, such as Stonecare PRO Signature's Marble Cleaner is a much better choice. If... Read More
How should a newly installed flamed granite floor be cleaned for the first time?
Viewed 463 times since Wed, Sep 5, 2012
Flamed granite has a rough texture which will tend to hold dust and dirt. Prepare a solution of stone soap or neutral cleaner and warm water. Flood the floor with this solution and either agitate with a scrub brush or machine-scrub. Pick up the... Read More
I can’t seem to mop my Mexican tile floor! It sucks up water as quickly as I put it on. Any suggestions?
Viewed 459 times since Wed, Sep 5, 2012
Has the tile been sealed? It sounds as if it hasn't been. Clean the floor thoroughly and apply several coats of a good-quality sealer. If the floor has been sealed, then it does not have enough sealer. Clean it and apply additional sealer. Read More
I just finished finished polishing a white Thassos marble floor. After two days the entire floor turned yellow. Help, what do I do?
Viewed 459 times since Wed, Sep 5, 2012
What process was used to polish the floor? I have seen this problem on Thassos marble when recrystallization has been used. If this was the process that was used the entire floor will have to honed to remove the yellowing. The yellowing is probably... Read More
What should I recommend to my customer to help keep the soap scum off their shower walls?
Viewed 457 times since Wed, Sep 5, 2012
To inhibit soap scum from developing, apply several coats of a good-quality impregnator to the shower walls, making sure to cover the grout lines where soap scum tends to accumulate. Let your customer know that if they spray a little neutral cleaner... Read More
When I attempt to apply an impregnator to a polished stone surface it stays on top and beads. Why is this happening?
Viewed 457 times since Wed, Sep 5, 2012
I would first check to see if there are any coatings on the surface of the stone. Use a wax stripper and remove any coatings before applying the sealer. Also check to see if the stone has been sealed before. Perform an absorbency test. TIP: If the... Read More
What’s the best way to clean grout off a newly installed marble floor without dulling the marble? All grout cleaners seem to contain acid.
Viewed 456 times since Wed, Sep 5, 2012
Several excellent grout cleaners are available from your stone care supplier that will not dull polished marble. Try a mild solution of bleach ; use a soft tooth brush to apply the solution to the grout joints and scrub lightly. TIP: Read More
When it rains, I notice a dark stain running around the perimeter of each granite tile on my back porch. This outline doesn’t seem to ever go away. What’s causing this and can it be cured?
Viewed 456 times since Wed, Sep 5, 2012
This shadow or halo is a sign of moisture in the granite. When the stone gets wet, it turns dark; the granite then dries from the center out, leaving a moisture shadow which has the appearance of a stain. To eliminate this shadow, the granite will... Read More
What can I tell my customer when they ask if they can use glass cleaner to clean their marble shower walls?
Viewed 451 times since Wed, Sep 5, 2012
Tell them simply this: "No, I would not recommend using window cleaner on a marble shower wall. Some glass cleaners contain chemicals which could damage the marble." Also, let them know to keep their marble shower walls in optimal condition the very... Read More
The Mexican tile on our back porch is displaying a green growth at the corners of the porch. The porch is outdoors, but is covered. What is this growth and how do I clean it off?
Viewed 451 times since Wed, Sep 5, 2012
The green growth you see is probably algae. Algae usually grows were there is abundant moisture. My guess would be that the tile stays wet after a rainstorm, allowing the algae to grow. To clean it, prepare a solution of bleach and water; about one... Read More
I just ground a granite floor and the grout is getting a white powdery residue on the surface of the grout.
Viewed 450 times since Wed, Sep 5, 2012
This is a condition known as efflorescence. There are soluble salts in the grout coming to the surface. The large amount of water you used dissolved the salts and they are depositing on the surface. Efflorescence will eventually disappear when the... Read More
My customer has a large water fountain in their hotel lobby made of coral stone. The problem is that there is a copper basin that holds the water. The copper is causing the coral stone to turn green and they are finding large green and white, hard de
Viewed 440 times since Wed, Sep 5, 2012
The hard, green deposits you describe is a combination of calcium deposits from the water and copper from the basin. The easiest way to remove them is to use a pressure washer. Be sure to test the pressure washer on an inconspicuous area, since too... Read More
Can I use a marble polishing cream in place of a powder? What’s the difference between the two?
Viewed 436 times since Wed, Sep 5, 2012
Yes, you can use a cream instead of a powder. However, the creams are usually designed for maintenance and not restorative polishing. Most craftsmen prefer the powders rather than the cremes. Give both a try and decide which works best for you. The... Read More
There is a deep scratch running up the middle of several granite tiles on my customer’s floor. is it possible to remove this scratch and blend the repaired area into the rest of the floor?
Viewed 434 times since Wed, Sep 5, 2012
Anything is possible, but in this cause it is very difficult. If the scratch is deep, there is a possibility that you will have to grind very deep which will put a depression in the floor. If this is case it is better to replace the scratched tiles.... Read More
Once I seal any stone, how long after something is dropped or spilled on it does it need to be cleaned up?
Viewed 430 times since Wed, Sep 5, 2012
All sealers, both impregnators and coatings are designed to slow down the staining process. This does not mean that the spill can be left on the stone indefinitely. It is always a good practice to clean the spill up as quickly as possible. TIP: Let... Read More