Stops flowing water or seepage under pressure through holes and cracks, and can even be applied under water. Expands as it sets to provide a permanent, high strength patch on cracks in concrete, masonry walls, wall-floor joints, swimming pools, water storage tanks, fountains, ponds, and drains. Also used for sealing around pipe/conduit or to anchor hooks, bolts, and metal to concrete. Ready to mix with water. One pound fills a crack 3/4 in W x 3/4 in D x 2.5 ft length, or 16.8 cubic inches.