I recommend getting some 3m rubbing compound and polish. If this is an industrial buffer you need to be careful if you've never used it before because you could burn off the paint. If it's the the orbital type "polisher" you will probably be ok.
I just found this on the net though, since you seem to be pretty new to this:
I'm not sure what type of pad, or "head" you are using, but buffing with rubbing compound is usually done by this : http://www.smarnold.com/Media/58-487.jpg
Napa is the only place I know of that sells 3M polishes.. You may want to just start with 3M microfinishing compound, and then get you some 3M hand glaze to shine it up. I never really had much luck with an orbital buffer though so if that's what you're using (and a 10inch is most likely orbital), maybe someone will post some helpful tips on that..