WeatherSkin Eco-Smart Epoxy series, WS HARDENER, is a liquid applied, water-soluble, inorganic silicate based compound capable of deep penetration of concrete surfaces to seal, densify, harden and water proof them. Lowodor, one step coating system. Excellent bonding strength, exceptional durability and seamless protection. This protection includes water, chemicals, solvents and oils during the products long life. Safe odorless and VOC compliant, it may be applied 7 -10 days after new concrete is installed. All surface water must be evaporated and concrete is hard. No need for acrylic or resin based curing compound or sealer.