ARP's Thread Sealer is a premium grade, designed for use on all wet deck cylinder block applications in order to prevent coolant leakage past the head bolt threads, while duplicating the recommended installation pre-loads associated with all ARP cylinder head bolts and studs. This thread sealer can also be used on pipe plugs, pipe fittings, fuel line fittings or any fitting that requires a flexible leak proof seal. Delivers flex-proof seal for use on aluminum, steel, stainless steel and plastic materials against coolants, water, gasoline, oil, natural gas and LPG.