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Return to Parts List Category : M- Oil & Chemicals HUG 3658 HYLOMAR SEALANT 1.2 OZ TUBE GASKET DRESSING / THREAD SEALANT. SEALS GAPS UP TO .010" $14.95 This is a gasket dressing/sealant used to seal gaps up to 0.010" (25mm) between machined surfaces. It is also used as a thread sealant. Though not a thread locker, HYLOMAR is an excellent anti-loosening compound. Originally invented for sealing jet engines, HYLOMAR brings superior qualities to automotive applications. Withstands constant temperatures from -60°F to 600°F. Never hardens. Impervious to most automotive fluids (including fuels and glycol). Will not drip or run. Will adhere through a thin oil film, minimum surface preparation needed. Use with copper head gaskets. 100 gram tube.