As a hobbiest who doesnt have time every day to work on my project, what stage of completion should a panel be left in before moving on to the next panel. Such as strip paint, do metal work (replace rusted metal), coat with epoxy primer. Then move to next panel? Or do epoxy and 2k primer? Do filler work? Knowing that it will be weeks or months before every panel is done, what condition should they be left in while working on the rest of the car?