I know you didn't tag me on this but... Are you wanting to shoot the whole side with color, or are you just wanting to seal the bare metal parts and then clean up the existing paint?
Primer alone is not a good as a protective sealant.
If it were me I would sand everything lightly, feathering the original paint into the bare metal areas, then coat the bare with a light grey primer, then sand lightly again, clean, prep, and shoot with color to blend, then clear coat if you want to go that far.
Edit: I may have read your intentions wrong, if so then disregard my babble...
Primer alone is not a good as a protective sealant.
If it were me I would sand everything lightly, feathering the original paint into the bare metal areas, then coat the bare with a light grey primer, then sand lightly again, clean, prep, and shoot with color to blend, then clear coat if you want to go that far.
Edit: I may have read your intentions wrong, if so then disregard my babble...
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