My mustang has a really really crappy paintjob (same paintjob from when I bought it) and its like peeling and stuff and the original paint is under there. I know that if the paint is good under there i'm just gonna leave it cause new paint will hold onto it, so that way I won't have to go down to bare metal. So my question is, how should I take off the "newer" paint? Do I just sand it down? and if so with what kind of sander?