I just got a Thuri and would like to use it as a finishing stone. Is it used like coticules which you raise slurry when you want faster cut and water only for finishing? I plan to use it after coticule w/water. I've been reading and it appears that people say Thuringian is about 15000 grit (relative). I have a La Grise coticule that would finish equivalent to around 10000. So I want to use a Thuri after this.