SB-4000 Water Repellent & Salt Blocker Invisible Penetrating Sealer is a penetrating, breathable silane/siloxane blend, water based, low VOC sealer that protects horizontal and vertical surfaces from water penetration and chloride salt damage from the use of de-icers or exposure to salt air. SB-4000 has the consistency of water and is milky white in appearance when applied and dries clear with an invisible finish. Some surfaces may darken slightly. SB-4000 is not hazardous and exceeds all VOC and EPA standards. It can be used indoors and outdoors on both new and old surfaces. SB-4000 can be applied immediately, as its unmatched breathability will not trap efflorescence. On new concrete, SB-4000 should be applied once concrete is fully cured (30 days after installation). SB-4000 requires two coats. Cured sealer is freeze resistant to -60°F (-51°C) and is stable up to a temperature of 180°F (82°C).