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If you don't sand through to bare metal or are trying to fill/smooth you don't need primer. You don't even need sealer if you sand gently with 600 grit.Sealer helps hide sanding scratches. You can spot prime if you find spots of bare metal. Ive had good bonding on reasonably good under-paint just scuffing with scotchbrite pads. You can paint outdoors in the mornings before the bugs and wind start up, but still use a good mask.