Opening the cooling system while engine is hot or running may cause severe burns. 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. When one of these parts fails, it can cause the head gasket to fail. Make sure these cooling system parts are in good working order before using Rislone Block Seal Head Gasket Sealant. If at any time the engine overheats, turn vehicle off and allow engine to cool. In addition, overheating can be caused by a stuck thermostat, bad water pump or defective radiator cap. Rislone Block Seal Head Gasket Sealant eliminates this problem. Overheating can be caused by a blown head gasket, cracked head or leaking block. Only Add to Radiator After Removing Antifreeze.Liquid penetrates large and small leaks to form a seal actually harder than the original head gasket.įiber additives lock together with liquid to increase strength and promote a permanent seal.

Dual Action 2 Part Formula-Twice the performance.Seals Block Leaks, Blown Head Gaskets, Cracked Heads and Other Hard to Stop Coolant Leaks.World’s Most Trusted Stop Leak Brand Since 1921.Detailed instructions on back booklet label take you through each step of using the product. Works effectively on cast iron or aluminum blocks & heads. Your vehicle is a good candidate for this product if it can idle for 20 minutes without overheating or having to add coolant. As these particles penetrate a crack or the blown head gasket area, they lock together and bond forming a hard permanent ceramic type seal. This product contains a blend of aramid and refractory fibers giving the strength of a bullet proof vest and the heat resistance of fire-proof clothing. For most vehicles, this is the last chance before going to a junk yard or paying an expensive repair bill. Rislone Block Seal Head Gasket Sealant is scientifically formulated to permanently seal coolant leaks that are the cause of most overheating problems.

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