[nikwho]

I would think that the vinegar would need to be neutralized. Being that you still have some rust down in those pits, I would personally use some phosphoric acid on the panel, to neutralize the rust. I have had good luck with it in the past, but i will tell you that I am not a professional painter, by any stretch! I have cleaned panels with soap and water, then with phosphoric acid, then with mineral spirits, then wax and grease remover, then, after tack cloth, shot with epoxy primer. I have had no adhesion issues do it this way.

Nik