An extremely rapid-setting cement repair material designed to stop the flow of water leaking through cracks and holes in concrete and masonry. Mix to a putty-like consistency and force into opening. Reaches initial set in 3 minutes, complete set and high strength in 5 minutes. Expands while curing to form a tight-fitting, durable, strong and permanent plug. For above or below grade use in horizontal, vertical or overhead applications. Apply underwater to seal leaks in pools or water gardens. Non-corrosive, non-rusting, and weather resistant.