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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

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

Can an impregnator be used to waterproof stone?

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

We have a large water fountain in our hotel lobby made of coral stone. the problem we have is that there is a copper basin that holds the water. The copper is causing the coral stone to turn green and we are finding large green and white, hard deposi

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

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

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

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