STAIN-PROOF^® Waterbased Penetrating Sealer, formerly known as Stain-Repella™ is a penetrating, invisible and breathable water-based sealer which protects porous surfaces against stains to keep surfaces looking good. STAIN-PROOF^® Waterbased Penetrating Sealer is suitable to use indoors and outdoors for a wide variety of locations, including floors, walls, building facades, swimming pool surrounds, patios, garages, countertops, kitchens and entertaining areas.