Installing natural stone? It should be sealed before setting the tiles to prevent unwanted penetration of grout into the pores of the stone, making cleanup easier.
Whether your new tile is natural stone or man-made, the grout should be sealed immediately after curing. The primary benefit of applying a sealer is to protect the new grout from unwanted penetration of dirt. By closing the pores of the grout, the sealer helps to keep soiling on the surface and will make it easier to keep clean, and will also help to keep your tile surface looking new longer.
While sealers will help to reduce the water absorbance by grout, they do not provide total waterproofing of the surface. But sealing does help in reducing the amount of water that grout will absorb, particularly in showers. This will help to reduce the level of humidity, which in turn reduces the buildup of mold and mildew.
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