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Re: Painting over Original Paint
Here is actual practical experience for your consideration. Original factory enamel paint with light surface rust. I used Metal Prep solution, which if I'm not mistaken is mild phosphoric acid in combination with wetting agents and other proprietary ingredients, applied to let stand, then gently worked around with very mild abrasive (my personal favorite is #0000 steel wool) until rust disappears. Rinse well and dry thoroughly. Others have bragged about how CLR solution does magic, but I find that stuff is weak childs play by comparison.
Next is buff and wax, or paint and polish to suit whatever your needs are.
This has worked well for me on many orig paint projects where saving lightly rusty factory paint was important. I would NOT recommend this for metallic paints, as the acid solution attacks the metal particles within the finish more aggressively than in solid color finishes. Please experiment at your own risk.
I have successfully sprayed single stage acrylic enamel directly over this very surface on several occasions without ill effects. If you choose a more aggressive topcoat, perhaps a good pre-sealer would be an option.
Before and after Metal Prep on factory paint:
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