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I'll be sanding it and powdercoating it w/ high temp clear, like my valve cover.
bigmacdaddy,

You know more about powdercoating than I do, but it is my understanding that JB Weld or other fillers should not be used on a part to be powdercoated?

A Shrinking Disc might help you in smoothing out high spots. Sunchaser Tools was one of the first companies to market this type of tool.

Tim