I got a good deal on a "loaded" SG body on eBay, and now I want to refinish it. I kind of like it the way it is, but it's for my daughter, for whom aesthetics are pretty important. It's black, and I think it's a catalyzed urethane paint. I want to paint it white, then she wants to do some hand painted detail before we clear it. Am I better off stripping it down to bare wood, or just roughing up the existing paint? The paint I plan to use (AutoAir) is water based and compatible with a urethane base. I've used it before over urethane before with good results, but just on a headstock, not a whole guitar. Having read all the posts about the effect of paint on tone, I'm worried that adding enough white to cover the black thoroughly, plus a clear coat, plus what's there already may make this sound like crap. So, is it worth the effort to take this down to bare wood? Or should I scuff it up and hope for the best?