Maaco does not peel off old paint or primer it. Not on mine, atleast
No you don't!
You might want to consider calling them to know for sure. :)
I think the panels that have peeled will need to be sanded down. Certainy worth it. They will sand it at comparitively excellent pricing. I still haven't found any flaws in their paint job. They sanded 3 panels completely down that had peeled, repainted , still very affordable.
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