non body man needs help

I agree with Rob, although we use etching primer at my shop sometimes, and my Boss actually prefers to uses a DTM (direct to metal ) 2K high build primer, If I had my choice, I would skip the etch and shoot the bare metal with epoxy.

Then when your ready you can lay 3 or 4 coats of 2k High build to block it out. Dont worry if you cant get back to it right away after shooting the 2K. Its better to let the primer and filler sit a while any way. This way it has time to shrink before your paint.

When all your body work and blocking is finished then you can reduce the epoxy and shoot it as a sealer but you need to lay the paint with in a certain time frame from sealing.