Masonry Water Repellent Chemical is used for surface treatment and impregnation of mostly all construction materials and substrates. The Chemical prevents premature deterioration problems related to efflorescence. The Chemical is resistant to alkali attacks and offered in a durable tack free finish. Masonry Water Repellent Chemical imparts water repellency to fired clay items such as bricks, roofing tiles, concrete masonry surface [pre-cast or cast], sandstone, concrete blocks, floors tiles, gypsum boards and some insulating substances.