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This half gallone bucket is used to stop leaks through brick and mortar with crack Magic. This is a brushable sealant seals cracks up to 1/2 inch wide on brick faces and at mortar or brick joints inter face. It dries to a clear , translucent milky film in several hours, cleans up easy with soap and water. A 1 gallon container will teat mortar joints surrounding approx 550 standard size bricks or 100 square feet of a wall surface. It so easy its like Magic!