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Q. What is the proper grout for an exterior limestone walkway? Is there a dry grout that can be swept between the stone? Where would I look for stone dust? A. The proper grout will depend on how the stone is set. Will it be set in mortar or placed on... Read More

Q. The installer of my granite countertop used a color enhancing and impregnating sealer.  I wish he would have asked if I wanted the deepened color. Is there any way to return the granite to the original color and then reseal with non enhancing... Read More

Suppose you have an interior granite wall that had some silicon caulking used in the grout joints. The silicon then caused staining along the grout edges. A poultice successfully removed the staining, but then later, the stains reappeared. What... Read More

Q. We have mold buildup in grout joints and surface has film on it. What is best to clean mold and remove film from surface?   A. There are several cleaners that will remove the mold but you must be careful to choose one that will not damage the... Read More

Applying an Impregnator to a Wall or Vertical Surface It can be challenging to apply an impregnator to a natural stone wall or vertical surface, because gravity causes the product to drip and dribble before it has time to be absorbed. It is no... Read More

What Impregnator is Supposed to Do Ideally, when impregnator is applied to stone, it penetrates into the pores of the stone. However, this isn’t always the case.  What Causes Impregnator to Bead Fred Hueston, Chief Technical Director of... Read More

Poulticing Walls and Other Vertical Surfaces Making sure that a poultice is held securely in place is important for several reasons: The poultice needs continuous contact with the surface to work properly. If the poultice shifts off of the stained... Read More

The "Orange Peel" Effect on Marble Working with marble polishing powders is both an art and a science. Improper use of polishing powders can result in what is known in the stone and tile industry as "orange peel," that is, marble that has a dull and... Read More

Graffiti Removal Procedure for Stone, Masonry, and Tile Surfaces By Frederick M. Hueston, www.stoneforensics.com If your beautiful building, wall, or other surface has just become the unintended canvas for graffiti, your first reaction might be to... Read More

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