I ended up sharpening an old pair of scissors on it to smooth it out.
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I don't think grit and mesh are the same. And when I look at dmt they are measured in mesh. So I wouldn't assume that the particle size is equivalent to an 8k waterstone. I did some looking and from what I was able to tell the mesh runs larger at higher ratings. Don't take my word for it though, I don't have any dmt's yet.
Michael