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fwiw I use the 3m PI III with the 3k discs follwed by PI SR and the SE (basically 3m by the book) the system works. I took 95%+ out of a realy nasty black jag XJ8 about a month ago it only took about 5 hrs. It seemed like the discs didn't last as long as I would have liked them to though, also the 3M SE is one of the messier/ tempermental compounds i have used.