I'm not really a slurry user, although I do have a coticule/BBW slurry stone. I'm soon to receive a nagura from OLD_SCHOOL for my nakayama, which is basically a little piece of a finishing stone. I actually wondered about trying the nakayama nagura on my little escher. I know it would be mixing stone types, but I'm sure the slurry from the nakayama nagura would be finer than just an escher slurry, so I can't see it hurting. It was just a thought that I had earlier and your thread reminded me.