Ultimate Grout Sealer penetrates deeply and then bonds with grout providing a long lasting, invisible barrier that makes cleaning easier. One of the most difficult and messy things for a homeowner to replace is interior and exterior grout work. Since the Sealer actually bonds to the grout, it is able repel water, food, grease, mold, mildew and more keeping grout looking new! It is colorless and protects the natural color of grout against stains. Ultimate Grout Sealer contains no harmful solvents, is non-combustible, and is VOC compliant making it safe and perfect for use on every type of grout.