Grout Shield grout sealer from Stone Works is a professional grade, water-based impregnating sealer with fluoropolymer that is far superior to "Home Center" products. It can even be used on damp grout right after you clean! It will protect tile, and grout from oil and water based-spills and dry soils. It penetrates deeply to offer the very best protection. It's effective on all grout and on absorbent and semi-absorbent stone and tile. Spray, roll, or sponge it on. Coverage is 300-1500 ft./gallon. Grout is stronger when protected with this durable sealer.