I usually use my DMT 325, but have used 225 wet/dry quite a few times and still use it sometimes on stubborn barber hones.

Quote Originally Posted by JimmyHAD View Post
Comparing grits of sandpaper with lapping plates, the Shapton GDLP is rated at 325 IIRC and the DMTC is also 325. Many guys, including me, use those with good results. The DMT X and XX are also recomended by DMT for lapping water stones and are coarser. I don't remeber exactly what the grit ratings are. The thing about a plate versus paper is that the plate will last many moons and the paper can add up over time. Also it is nice to lap right in the sink with a plate letting the water trickle down and wash away the swarf as you lap.