Fast-setting Hydraulic Cement in dry powder form that after mixing with water, instantly plugs leaks in masonry, cracks in pools, walls, floors and other places, in less than 7 minutes. It replaces the use of cement. It is nonmetallic, non-oxidizing, and non-toxic and when cured it is non-shrinking, but expands as it sets. Ideal to anchor bolts, machinery and pipes, because of its high structural strength will even set under water making it ideal to repair docks.