Thread: What is the highest grit you have used on a stone?

Originally Posted by Brighty83

Edit: This jnat stone i lapped from a 40 grit lol but it was in really bad condition. I first started with the 220 DMT and when i realised that wasn't working i put in on my belt sander. That didn't do anything so i purchased some 40, 80, 160 grit and so on - Took me 6 hours to get it flat (minus a break here and there).

I find SiC powders on float glass considerably faster. It may be there is no cushioning from the sandpaper but I can't imagine spending 6 hours, even on a hard stone.