A versatile high-performance patching compound formulated to stop running water through deep cracks holes and imperfections in concrete and masonry surfaces. Creates a watertight seal in 3-5 minutes even while water is flowing. Works both above and below ground level. Also great as fast-setting anchoring cement to permanently anchor fence and railing posts bolts machinery and fixtures into concrete and masonry surfaces. Interior/exterior use. Size: 10 lbs Color: Gray Stops & seals leaks in concrete & masonry Creates a watertight seal in 3-5 minutes even while water is flowing Interior/exterior use Also great as a fast-setting anchoring cement to permanently anchor fence & railing posts bolts machinery fixtures into concrete & masonry surfaces . Clean up & storage: Wash skin and hands with soap and water. Wash tools immediately with water. Cured material must be scraped away. Close container tightly and store in cool dry place.