StoneTech Impregnator Pro, Heavy Duty Sealer for Natural Stone, 1-Quart (.946L) Solvent based sealer which preserves the natural look of stone surfaces Heavy duty protection against most stains in interior and exterior use Up to 1,000 sq. ft. of coverage per gallon, depending on porosity of stone Expected wear of 5 years for interior surfaces and 3 years for exterior surfaces Recommended surfaces include: granite, limestone, slate, travertine, bluestone and sandstone