I'm finding it very odd that most of the old-stock, new panels I have bought in the last few years (quite an acreage! ) are in excellent condition. After 30+ years, some of them are showing no surface signs of rust.
It's going to take quite a lot of work to remove all this paint so that I can apply my standard preparation technique prior to re-painting.
Whatever is in the paint does a good job without any topcoats....just as long as it's not fitted to a vehicle.
Has anyone successfully painted a car using new Fiat panels without completely stripping the pink-primer back to metal?

Here's a small sample of the panels for my van.:bang::bang::bang:

COR_9978 by Peter Thompson, on Flickr

I've used LR factory panels in black primer, and aftermarket ones that have coated their panels with a yellow film. The primer ones were fine to scotchbrite and then paint. The aftermarket had to be taken back to bare metal.

You could try scotchbrite, panel wipe and then an epoxy sealer. That should make it safe for using whatever base coat you want on top.

Cheers, Steve

As long as its not the cheap process, where when you start sanding back the primer pulls off the panel. Then you should be able to sand back using 180-240 grit enough to key the paint surface and then etch any bare metal and re prime the panels.
Due to the age of the primer I would go a little extra than scotchbrite as primer can become rather hard over the years and so the adhesion wouldn't be great. Also due to being more porous than top coat you want to make sure there is no light corrosion.
I know on some of the new panels I used the black paint just starting peeling back. It was also full of dust etc which would have meant sanding it all back. But instead I sent my shell for a sand blast and fresh primer