dizzy, I can't answer your question about the rough buff, but my wife has a xxcel & the factory finish was 1000 grit abralon, not polished. I used 3m finesse-it to polish it & it goes longer with a huge backend. If you have rough buff, it should be OK to use it, but I'm not sure what finish you would end up with. The 3m rubbing compound works great also, but that only takes it up to about 1200.
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Wayne
Hardcore FOS