sand it to bare metal, use a self-etching primer/surfacer which is sandable. Urethane paint is pretty tough, I put 3 coats of single pass urethane on an 83 Peterbilt I used to own and it looked very nice until the moron I sold it to used a razor blade to cut off the signs from the doors. This paint won't get rock hard, like enamel, but stays somewhat soft, on a hot day, you can press your fingernail into it and leave an impression, but it will smooth back out. It's pretty resistant to rock chips and will flex with the body.
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'72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84
ralleys and 31/10.5s
67 Cutlass convertible
330, 3spd stick
90 GMC Jimmy
350/auto
Chad Stephens
Orleans,NE
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option
00 Dodge 2500 4x4, 24V cummins, 5 speed
Chad
South Central Nebraska
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