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I have used DP-300 on sealing valve cover bolts and gaskets and spark plug well cover seals on my '89 Taurus SHO. The latter are notorious for leaking oil and water into the spark plug wells when using any other gasket sealing material. The wells stay completely dry over a 60,000 mi spark plug change interval with DP-300.
I have even used it to stop a leak on the front main bearing seal without dropping the oil pan to repair/replace the seal by applying DP-300 against the OUTSIDE of the seal/ oil pan interface. Amazing.
More expensive than similar products but uncomparable performance and worth every penny.


