S-1 is a two-part Clear Penetrating Epoxy Sealer. Mixed at a simple 1:1 ratio S-1 is extremely effective at prolonging the service life of all woods, concrete, metals and fiberglass reinforced polyester. S-1 is ready to use with no thinning required. S-1 has a long pot life and can be applied with a brush, roller or spray equipment. It is completely waterproof and suitable for use above or below the waterline. S-1 does not require sanding between coats if recoat time is less than 24 hours. It is resistant to salt air, mild acids, alkalis, chemicals and solvents.