Reply To: RTV exhaust gasket sealer

[A. Hoskins]

I think the answer to the question is “No”. According to Permatex, the black RTV is good to about 500 degrees F. Permatex Ultra Copper says it’s good for 700 F. I cut gaskets with a slow hand (Clapton ?), working with a No.11 Exacto on a sheet of plate glass. It takes many, many passes with the knife. I do the bolt holes in a drill press by spinning sharpened gasket punches or brass shell casings and backed up with a piece of wood. The result is clean and neat.

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