Dow Corning 777 Potassium methyl siliconate Dow Corning Water repellent >> Silicone Water Dow Corning ® 777 Water Repellent is a water-dilutable solution of potassium methyl siliconate designed to impart water repellency to a wide variety of surfaces. Supplied at a concentration of 40 percent in water, Dow Corning 777 Water Repellent is usually diluted to a concentration of 3 percent or less before application. The siliconate reacts with carbon dioxide in the air to form an insoluble water- resistant treatment within 24 hours. Water repellent for masonry surfaces As a surface treatment in applications that utilize its ability to impart a water repellent surface and reduce water absorption For use on bricks, sandstone, limestone, and ceramics Imparts water repellency to a wide variety of substances Reduces water absorption into the substrate, thus reducing spalling due to freeze-thaw and efflorescence, thereby increasing the life of the substrate Colorless and non-yellowing protection preserves the natural appearance of the substrate Penetrating and breathable Low VOC Nonflammable Water-dilutable potassium methyl siliconate solution Clear to slightly yellow Low VOC, nonflammable, water-dilutable potassium methyl siliconate solution. Used to impart water repellency to a wide variety of surfaces. Reduces water absorption. Can be used on bricks, sandstone, limestone, and ceramics.