Compare that to p2500 grit paper at 8.4u. If you look on either chart you can see the WEPS 1000 grit stone is at 7u(microns). There is a BIG micron difference between these types. I have found the very fine grit wet/dry auto paper usually has a designation of “P” in front of the number, p2000, p2500, p3000, etc. Wizard can correct me if I am getting this wrong but most sandpaper here(U.S.A) is in the CAMI(Coated Abrasive Manufacturers Institute) scale. Here is a quick read to see the differences: The confusing part is there are at least 3 or 4 grit “standards”. I also use sandpaper strips in the higher end area with great results. Wizard at one point even mentioned Komitadjie as his inspiration in doing his own independent version.

I havent double checked that the values line up for every single thing between charts but Id guess the results are very similar for what we are interested in. Wizard and a fellow named Komitadjie both have made serious attempts and put ALOT of effort to make similar versions of a Comprehensive Grit Comparison Chart.