By the way PC, there is no doubt you know your stuff,the Japan and the good 3m papers are fine....Mirka ought to be run out of business. their paper is crap.It cuts once or twice then its just nothing more than smudge paper.I got boxes of the stuff cause I got a "good" deal on it from SmartShoppers.Penny wise pound foolish. There production 36 grit dulls so fast that sometimes if I am out of new 3M,I put an old 3M sheet on.