Sorry to resurrect this but I stumbled across this thread while looking for something else. One thing I noticed in it is there were no opinions expressed by professional paintings irt Nuvite and eventual painting.
My understanding from those who do this professionally is that there is an etching process that takes place and a good scrubbing to remove contaminants.
When polishing anyway, of course, care should be taken to remove excess polish around rivet heads (mineral spirits and elbow grease works).
Whether you polish or not, there's going to be a fair amount of oxidation on your aluminum by the time you get around to having your ultimate solution in place and there has to be some mechanism for removing it. I would think if a paint shop properly prepares a plane for painting, it would involve removing that oxidation and I would also suspect that preparing a surface by treating it for removal of any buildup -- Nuvite included -- would be a standard.
Anyway, I'd like to hear from the paint-shop pros on this question. I'm polishing my plane, but it will eventually have at least a small stripe down the side.