Hi-Gear INSTA-SEAL BIG BLOCK SEALER, a metal sealant for repair of cooling systems of engines of trucks, buses, construction machinery. A metal-and-ceramic sealant for repair of leaks of gaskets, cylinder head and unit, radiators. It comprises a unique combination of the thinnest ceramic fibers which provide the repaired area with additional strength and which can repair the damages of a larger profile. It can be used with anti-freeze or water!