Ok three is acceptable. The first two took for ever so sand the paint off. Then I remembered the paint eraser, I was so stupid for not remembering sooner. Strips it right off. I did one with a sanding disc, it removed the primer fast as well but really roughed up the metal compared to the paint eraser.
I think the problem was with the cheap gun I was using, should have used the good gun since I was not planning on all the sanding steps. I just hate clogging it with primer. Next time.