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You could use any variety of automotive primers but the thermal cylcling around the valve cover would probably eventually knock off most things you would use. Epoxy primer is a good bet for survivability but it is not really a primer filler and does not sand well at all. I would try a thin coat of JB weld or my favorite Loctite Weld. Let it harden and then sand smooth. You could also try any other kind of epoxy or metal filled epoxy as a filler.
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Saskatoon, Saskatchewan
Canada
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