I've also bee working on the body paint. This didn't go well. I'm using an air brush for the first time. I think and need some practice and a finer tip. I stop touch paint for now. Just hit this spot where the fender flares rubbed through primer exposing body metal.
I started by cleaning metal with an acidic POR prep that removes rust haze. Then I sprayed in a two part epoxy primer (nasty stuff to breath, so respirator mask on), which is ready to top coat in 15 minutes.
The top coat cost me $60 for 4 oz, pricey stuff. It sprayed on hazy, not glossy like it should. I believe it's due to the spray pressure I used. I need lots more practice.
While that area cured, I moved to rock chip, scratches and what have you in area. These are ones that just broke through top coat. These still have primer in them so no need to de-rust or use my primer.
I use a hand microscope to inspect each chip in paint. I do this to make sure it's cleaned out of rust, dirty, calcium, wax or whatever. Anything left on/in surface and I'll not get a good adhesion and make worst than just leaving alone.
I did find what is either calcium or wax/rubbing compound or both in chips with microscope. I started with my mildest chemical to clean out, than work my way to my strongest. Nothing was make much difference. I got out pressure washer and tried clean out chips. It all helped a little but not enough. So I called Cortland detail shop in LA. He's does detail for high cars and Hollywood shows like fasten and furious. He's my go to guy for anything detail. He said at this point I should keep washing with HP. That it may take 20 or 30 washing over time. That if I try stronger chemicals, I may damage the paint. That patients is key here. Not what I wanted to hear. He suggest I use a paste wax with red color. That it will cover and look great. Bummer!
At this point I decided to wipe with paint reduces the one spot I shot, pulling off over spray and let it all be as is. It's rust protected where I found it needed, but not as pretty as I'd like. So I have to rate paint a 8 out of 10.
Epoxy primer shot on brae metal after clean up prep.
Top coat shot. To much pressure in air brush I think.
Wiped to remove haze and level off, with micro fiber wet with reducer, wrapped around plastic card for control.
Ugly but protected!