Ok Let me see if I can get this written so it's clear. :shrug:
'If' the 4K has already been lapped it should be smooth. Since mine is I use a DMT 325 and some water and just give it a few laps and round the corners then use a spray bottle of water to rinse any slurry back onto the hone. This leaves not only the slurry but a 'fresh' surface.
The slurry multiplies the amount of work being done. That's why I do it on all of my hones.
If you haven't seen Glen's wonderful video on how to set a bevel and finishing an edge on the Norton 4/8K here it is.
https://www.youtube.com/watch?v=y53SL9QMq6I
While Glen uses a 'slurry' stone the DMT 325 works well.
I hope this works for you. :tu