DRYLOK Gray Latex Masonry Waterproofer, 1 Gallon is specially formulated to provide reliable waterproofing for all interior and exterior masonry surfaces, including walls above or below grade, cinder and concrete blocks, stucco, brick, retaining walls, basements, swimming pools, bird baths, fish ponds, and foundations. This waterproofer effectively stops water pressure up to 10 PSI, which is equivalent to a column of water over 22 feet high. For results, any chalky efflorescence deposits should be removed by etching the surface before application. Its alkali-resistant formula can be applied on slightly damp surfaces below ground, though dry surfaces yield outcome. The low odor, VOC-compliant formula cleans up easily with soap and water and can be applied with a brush or roller. Each gallon covers approximately 75 to 125 square feet. This latex-based DRYLOK product is backed by a 10-year manufacturer warranty, ensuring long-lasting protection and peace of mind.