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Single stage is just that...one stage. It use to be used world wide on all makes of cars, but without any UV protection it it fades and oxidizes pretty fast. Most qaulity work is done with 2-stage systems for better matching and longer life span. If you paint now is cured and stable you should be able to just sand and paint it. Soft flexable bumpers do need t o have flexible primer and clear. Single stage other than laquer is hardened, Enamel is junk, urethane is better, 2-stage urethane is best.
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