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Q. Our installer grinded off the top layer of our limestone floor and since then we have repeated powdery residue on limestone despite numerous washings and sealings/impregnatings. Why is this and can this be fixed as I don't want to have white... Read More

The acid has etched your marble, which will now have to be polished or (possibly) honed. Depending on how deep the marble is etched it may require a heavy grinding. Perform a test in a small area to determine what grit diamond will be required. Make... Read More

Think Twice Before Using a Silicon-Based Impregnator on a Historic Limestone Building Limestone, a calcium-based sedimentary stone, is a building material that has been utilized for centuries. The Pentagon, the Lincoln Memorial, The Empire State... Read More

Be sure to cover your poultice with plastic in the case of rain. You may find that the poultice may dry too rapidly outdoors. Try covering with your poultice plastic with a layer of black plastic to block the sun light. TIP To prevent rain from... Read More

Smoke stains can be difficult to remove, and may require the use of a poultice. There are several gel-type cleaners that will remove smoke stains; ask your stone supplier for a recommendation. The gel cleaners are brushed onto the surface and allowed... Read More

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 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

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 purchasing... Read More

Someone recently commented on SurpHaces social media, asserting that Grout Color Sealer cannot be considered a permanent solution. Here is their comment and our response. Comment: Grout Color Sealer is Topical. Will peel or uplift sooner than later.... Read More

Q. I'm a park educator (park naturalist) working at a fossil site in Canada. I'm putting together sets of fossils for use in classrooms, including some Green River fish fossils, which are in very soft limestone that flakes in delaminates... Read More