Sand it down to the factory primer with 80 grit. If there is rock chips or rust pits it may be a good idea to take all they way down to the metal using 80 grit. Then give it a couple of coats of epoxy primer. Sand the primer useing 120 to 240 to 600 grit paper.
Wipe it all down with wax and grease remover and a tack cloth and then paint. Since the quality of the paint job doesn't seem to be important I agree with cali_surfer about the single stage urethane.
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Ben
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