I use the ceramic toolbox stones carried by Lee Valley Ceramic Sharpening Stones - Lee Valley Tools
I've been told that to keep then working well they need to lapped every once and a while to refresh the surface, as the abrasive wears smooth instead of breaking and revealing a new edge, like water stones do.

My question is this, to those who use ceramic stones, what do you use to lap/ refresh them?

I'm tempted to try a low grit diamond paste. I have a couple of old Lansky system diamond stones, but they wear quite quickly and I'd rather not use them if they are going to get lapped more than the ceramic. I'm assuming that this rate of wear is not typical of DMT hones.
for what its worth, I have restored four razors ranging from one very rusted to an uncared for NOS, and feel that they have done an outstanding job.

Thanks for the help!