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You can buy SEM or other quality etching primer in a rattle can at a local auto paint store. It's a good idea to use that over bare metal.
As your post implies, you need to prep and paint in no more than a few days. Some newer primers are "self healing" meaning they will flow to smooth their own surface over time and you have to sand again before the color coat or it could come off in sheets. I've seen that happen. Not pretty.
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techweenie | techweenie.com
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