The other panels might never fail like the roof even without any special treatment. For clearcoat to fail like that just because of UV exposure is very, *VERY* uncommon. So rare that I think something else was going on there that thinned the clear in those areas of the roof. Like...somebody (previous owner? dealership when "new"? coulda been anyone..) buffed it too aggressively and took off a few too many microns of clearcoat, resulting in premature failure due to increased UV-vulnerability. Or maybe it got run through a carwash where rollers/etc. always rubbed those sections of the roof. OR a combination of those two guesses. Generally, paint just doesn`t fail like that, let alone in somewhat isolated "blotches" like what`s in the pics. Note that the rest of that leading edge is OK even though it oughta all be uniformly weathered.
IMO you oughta just bite the bullet and have the roof repainted by somebody who knows what they`re doing. It`s already failed, and it`s only gonna get worse. You got sold a vehicle with paint issues, simple as that (sorry to say).
Easy for me to spend your money, huh? And that wouldn`t be the cheapest panel to paint either.
You can keep it from turning into a complete rusty mess by using a paintcleaner (not an abrasive polish, that`d make things worse) to reduce the oxidation and then wax/seal/whatever to provide a sacrificial barrier between the messed-up paint and the elements. It`ll still continue to fail, but if you redo it often it won`t get all that much worse.
If you don`t do that, and keep doing it, it`ll eventually turn into really awful surface rust.
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