How's it do on unetched aluminum?

I'm afraid the etching process will discolor my pretty polishing.

So far, I've got the gluvit surface prep sanded with 80 grit, all the paint removed, sanded the aluminum with 150 grit (a little heavy as it turns out) and made two passes with a scotchbrite attached to a finish sander. Because of the 150 being too heavy uit'll cost me a couple extra passes with the scotchbrite......

She's polishing up real nice.....maybe I'll run take a pic.