Sika Thoroseal® 581 White is a high-performance waterproof cement-based coating designed for concrete and masonry surfaces. Formulated to provide a durable, watertight barrier, it helps protect against water penetration while resisting mold and mildew growth. Suitable for interior and exterior applications, it is ideal for foundations, retaining walls, water tanks, basements, pools, and other concrete or masonry structures. Approved for use with potable water and supplied in a 50 lb bag.