A compound used to seal leaks which have significant water flow. It is classified as an emulsion grout. It is a patented blend of rubber emulsions mixed with additives to promote flow and adhesion. The emulsion is stable until activated. It then breaks, and the colloidally dispersed rubber coagulates to form a jelly-like mass of matted rubber particles. It contains no toxic or hazardous materials other than ammonia solution, which is present as a preservative.