Disclaimer: I don't have the means to strip and paint my car at one time so I must do my work a panel at a time the reason I chose to do it this way.

So I tried my hand with an air brush today. I used it to shoot all of my stripped panel edges and weld seems on my car with epoxy sealer since it was bare metal. I am just doing the passenger side. Quarter panel, door, fender. I wasn't quite ready to shoot the rest of the panels and I hated to mix up such a small amount for my HVLP gun. I just wanted to protect these areas from rust before I can do the rest.

I used the little red cap off the top of a WD40 can to mix my epoxy. I dipped it into my epoxy twice and poured it into a mixing cup, then added one cap full of hardener. 2:1. Since I didn't have to tip my paint can to pour, it made minimal mess.

With this small amount, I was able to cover the entire weld seem around my wheel arch, all door edges, fender edges, door jamb edges, and some other areas.

Interesting... I can't understand risking having WD40 anywhere near a paint project let alone mixing primer or paint in a wd40 cap... I've seen to many disaster cases from Wd40..crazy risk..

What I'found is those little medicine cups they have in the hall in hospitals won't be affected by solvents and have measure marks engraved into them.

I belive in small batches but won't let WD40 or it's cap anywhere near a paint project..
Fisheyes are for fish

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I agree that it would have been risk had I not throughly cleaned the cap in hot soapy water and washed it in wax & grease remover before hand. I probably should have mentioned this and not assume everyone would know it must be clean. It just happened to be what I had available. I don't use the WD anywhere near where I paint. I don't have a paint booth though. I did this in my open driveway.

But I like the medicine cups idea MUCH better.

We use the "pyrex" measuring cups, or whatever they're called. You can get them from wally world, they're for cooking, and come in may sizes, from shotglass lookiing cups and on up. Nice thing about them is, they're marked very legibly, super easy to clean up, and can take a beat'n....been dropped on the concrete floor multiple times with no problem.....but once in a while they hit the floor just right and they will break.

I hope you put on several coats using the air brush. They are not meant for heavy coverage, so it may be real thin where you sprayed.