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Pot metal is generally zinc. PPG makes a product called Speedhide, which is a galvanized metal primer, and galvanization is the addition of zinc to a metal. Not sure if it will work in your application, but it's worth looking into.
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 1987 560SL
85,000 miles
Meet on the level, leave on the square. Great words to live by
Were we directed from Washington when to sow and when to reap, we should soon want bread. - Thomas Jefferson: Autobiography, 1821.
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