Ultimate Stone Sealer - Designed for deep penetration and immediate application on stone, grout, masonry, concrete, and more. Forever stone sealers have been either water-based or solvent-based. Each type had its benefits. Ultimate Stone Sealer now includes the best benefits from both formulas… Our ‘HYBRID’ formula is true water and solvent blend that’s faster, safer, and easier to use than any other traditional impregnating sealer available today. It penetrates the stone, leaves a natural look finish, and provides unmatched stain protection. This new AC Technology allows for an extremely low residue ‘Hybrid’ formula that is easier to use, has a low odor, and is nonflammable.