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painting painting metal

  1. Problem w/ polyurethane top coat over spray paint

    I am painting a shot put, as in a 6-lb iron ball for track-and-field. I sanded off what was left of the old finish. I put on a coat of Rustoleum metal primer (spray). I put on a few coats of oil-based Rustoleum paint (spray). The problem is the protective coating over the paint. I tried a...