A couple of questions before I spray my guitar. If you've sanded you're guitar down to the grain, what do you clean it with before sparying? Just water, or something else. And also, I have a little ding in my guitar that I wanna fix before I spray. It's not very deep at all but since I've sanded down this much I might as well fix it. I'm not doing a wood grain finish so the color of whatever filler I use shouldn't matter. What would you guys use?