Bar's Leak Head gasket sealant is scientifically formulated to permanently seal coolant leaks that are the cause of most overheating problems. Works effectively on cast iron or aluminum blocks and head.
Stops block leaks
seals cracked cylinder heads and blocks
repairs blown head gaskets
dual action 2 part formula — liquid ceramic: liquid penetrates large and small leaks to form a seal actually harder than the original head gasket — reinforced fibers: fiber additives lock together with liquid to increase strength and promote a permanent seal
head gasket sealant is not compatible with antifreeze and must only be added to the cooling system after all antifreeze has been flushed and removed.
Opening the cooling system while engine is hot or running may cause severe burns