I have used all my Coticules and Japanese Naturals without any lapping when I have first received them. I have never had a problem with any of them. Actually, the only lapping I have done on them has been when I dished them out from using rubbing stones to generate slurry. In those cases either the GDLP or the DMT 325 has worked fine and there has been no difference in the stone after the lapping at all.................yet.

I don't think I can dish out my Translucent even if I fired mortars into it.

Have fun.