Hey Stomper, that would be a very difficult task to accomplish. There is no specialty products that address this. Paint composition has changed dramatically through the decades and now were heading into new territory with the Low VOC and waterborne stuff. It gets quite complex.
I am a beginner, but after doing some research I ended up listening to some very experienced people on this website and decided to tackle some areas of rust repair on my truck.
Check this product line out:
https://www.southernpolyurethanes.com/
Barry the owner will speak to anyone wanting to do his own paint job. He is not arrogant, and has a high quality product with consistency. He does his own QA before it leaves his plant. Competes extremely well with PPG, Dupont and puts some shame on them.
His Epoxies for primer and hands down easy to work with, they can be brushed also for spot repair. That stuff sticks to metal if you follow his instructions to a T. Its a fun thing to do and the costs are affordable comparatively to the high end.
Something fun to get into and with patience you can end up with a dynamite job.