Etching primer is what i use. To properly use expoxy you have to use etch before and it seems like a waste of money if your not going to stowe the car in a corner for a few years. Of course you will have to re etch and apply 2k primer when its gets to the point of body work. But for the time being with the car indoors and constantly being worked i go with etch. There is a huge debate with the two but if you do it right with etch and cover it right after you will be fine