After trying multiple compounds including M105 and M205 and often getting disgusted with the results from the 105 (being very finicky) I tried 3M compound, finishing polish, and ultra finishing polish. It is their "Perfect It" line. It is the best stuff I have ever used. Very easy. Doesnt care if the surface is a little warm or if its humid or dry. It cuts very fast and the polish finishes off very very well. Better than the 205 does. I use a Flex rotary with it at 2500rpm all the time. I was wondering if anyone else has tried this?