Portland cement-based specially formulated to form a hard impervious surface that waterproofs, seals and protects below grade exterior walls constructed of concrete, stone or masonry. Use for coating drinking water holding tanks or cisterns, birdbaths, fountains, crawl spaces, exterior above-grade or interior basement and garage walls. Can be applied to damp walls. It also reduces Radon Gas penetration. Covers up to 600 sq. ft.