Since 1914 the reliable permanent sealant for radiators water jackets and cylinder heads. PERM-O-SEAL is the longest-lasting hole and crack sealant available and nothing works better! PERM-O-SEAL is a non-toxic mixture of seven organic ingredients designed to permanently seal holes and cracks in radiators water jackets and cylinder heads. Just pour PERM-O-SEAL into the radiator while the engine is running. It speeds through the water channels seeks out holes and swells shut as soon as it comes in contact with air (on the other side of the hole). It will not redissolve and draining or flushing will not affect the seal. Manufacturer: J-B Weld
