I just had a new 4" green Rupes pad fail on the 1st use, 3rd section. Rather disappointing. Never used the blue, but the yellow & white are fine. Certainly hope it's from a bad batch, as my mini Rupes is an invaluable tool. Speed 5 with light to moderate pressure & Menzerna 400 heavy cut
Theres a known issue with FG400 and Rupes pads as Dylan mentioned in another thread.