Expert Answers in

ANSWER - I would be surprised if the brick is made of porcelain clay which is very dense and has 0.5% absorption or less.  There are some very dense clay brick. Stucco is a weak…

ANSWER - The grout that you used may be a polymer modified grout similar to a grout with a latex additive.   Acids won't attack the polymer, but there are products for removing latex haze.  Try…

ANSWER - Like snow flakes there are no two marbles that match exactly.  That is true for any natural stone since it is nature made.  Natural stone inherently varies to some degree depending on the…

ANSWER - Regarding whether sealing a cementitious grout makes it waterproof, it doesn't.  Using an appropriate penetrating sealer over grout will make it moisture resistant, it will make it stain resistant, and it normally will…

ANSWER - The unglazed porcelain tile should technically be impervious with an absorption of 0.5% or less.  That doesn't mean it can't stain, when it can if something is left on it long enough and…

ANSWER -  The transition joint between the top of the bathtub flange and the wall tile is not supposed to be filled with a cementitious grout.  It should be filled with a resilient ASTM C920…

ANSWER - In spite of the name suggesting it is granite, Petit Granit is known as a Belgian Limestone.  Several sources on the internet state not to use it as a countertop and say it…

ANSWER - I assume this is an exterior application of the sandstone in a flagstone irregular shape.  Sandstone is Quartz stone from a geological point of view, but it is a class 1 that is…

ANSWER - Since you have a glazed ceramic tile it should come clean unless it has worn from abrasion.  Glazed ceramic tiles don't normally fade, but some of the softer glazes might to some degree.…

ANSWER - You didn't indicate if the mosaics are ceramic mosaics or glass mosaics. Ceramic mosaics are normally produced at over 1200 degrees F.  Normally custom ceramic tiles are dried and then fired in a…