Grout sealer, a necessary component of the tile installation process, serves to prevent moisture from working its way into the grout and under the tiles. Grout fills seams between tiles. Most grout you will be using is called sanded, meaning that grout contains sand. Sand is used by manufacturers not just because it is literally dirt-cheap but because it is a good material for what is a simple job: filling in a hole. Grout is not needed to stabilize tile because mortar already holds the tile in place without any extra help. Sand is porous, which means that grout is porous. Once grout has been applied and dried, it is ready to absorb any liquid that comes its way--like water. By penetrating the grout with sealer first, you are pre-empting water and other liquids from penetrating the grout. Grout sealer is that simple.
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