Paint delamination touchup, what am I doing wrong?

All bets are off with rattle cans. Bottom line is something you are spraying doesn’t agree with something on the car.

You don’t need etching primer you need a sealer, and let it dry before topcoating. So you seal off what’s below.

Let’s move into the current day and use automotive grade paints with hardener. I used a low buck HF touchup gun for jobs like this and it works good.

A preval sprayer is just a piece of junk. The pressure drops as the propellant is used, how can you get a good result? I tried these things and it just makes it much harder to get good results. Wasted money is never a bargain.