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Get a wire brush for your grinder and clean as much of the surface rust off as possible before applying any paint. Hammerite used to be brilliant but now it's not solvent based you're better off with normal etchprimer and paint.
If I'm building a rally car or off roader I used truck bed coating on the underside and up to the bumper line.
If I'm building a rally car or off roader I used truck bed coating on the underside and up to the bumper line.