Quote Originally Posted by Stewie Simpson View Post
Hi Pat; some of the diamond pastes and honing sprays available on the market are down to 0.5, 1, and 2.5 micron in sizing. http://www.bestsharpeningstones.com/...mond-Spray.htm

Stewie;
Norton goes down to 0.25, PSI goes to 0.1, and others go even lower, particularly if you include CBN.

I have both 0.25 and 0.1, though I almost never use the latter because I've found it to be more hassle than it's worth. Probably the biggest hassle is that you'll end up polishing one or two spots on your blade unless you either use a flexible backing or your 0.1 um plate *exactly* matches the flatness profile of your next-higher plate. I mostly got it out of curiosity. For most things I stop at 0.5, and even that is probably overkill with a tightly-graded (low max grit size) paste.