Stone Spray-N-Seal® is a water-based penetrating sealer that protects natural stone surfaces from staining. It is wonderful for stone countertops, floors, walls, vanities and even grout. This below surface sealer is also ideal for sealing all types of masonry, stucco, concrete and sanded grout. It has a special blend of polymers that bond to the stone and creates a water and oil repellent membrane to prevent staining, yet it allows the stone to breathe and release moisture vapors. It is safe for interior and exterior use and is UL Classified for slip resistance. This stone sealer will not alter the color of any stone, tile or grout.