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Sets in 3-5 minutes. 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.Just mix with water to putty consistency. Each pound fills a crack 3/4?wide x 3/4?deep x 2.5? length, or 16.8 cubic inches.