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Quadex® WL250 Water-Based Silicone Sealer is a high performing, low VOC deep penetrating sealer for hydrophobic (water repelling) properties and deep, life extending protection. WL250 is not visible when dry and does not change the appearance of the treated surface. Its proprietary formula uses a special Silane/Siloxane blend to give you a great hydrophobic waterproofing effect on the surface as well as deep penetrating molecules for long-term protection throughout the concrete.