Expert Answers in

ANSWER – If you are using a cementitious grout it should harden.  If you used too much water in mixing the grout and/or too much water in cleaning the grout during the installation of the…

ANSWER – It depends on the application on whether waterproofing under a tile installation is necessary.  If it is in a wet application and in some exterior applications, then it is necessary to waterproof the…

ANSWER – If you rub too hard you might damage the tile.

The best approach is to contact the manufacturer of the urethane grout and ask them how best to remove the urethane grout haze. …

ANSWER – Limestone stone is a calcium carbonate sedimentary natural stone.  It contains various minerals such as ferrous oxide that when subjected to excessive moisture can develop mineral stains.

Sometimes this is just minor staining…

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…