Quote Originally Posted by jimnolimit View Post
from my understanding:
4k grit = 5-6 micron
8k grit = 3 micron

why would 3 micron diamond not be good after my 4k stone .

Primarily because:

A) Grit ratings are not universal

B) the cutting action of stropping is far different than the cutting action of a hone.
While a fine 8k hone will refine the entire surface of a bevel maintaining a flat and polished edge, stropping will remove material from the very edge of the bevel due to it's nature. in order to progress past 4k you will have to do a lot of refinement, which means a lot of material removed.

The final product will likely be something of a convex edge. i don't know if this is a good thing or not. I'm sure it's possible to create a shave-ready convex edge, however i can't speak on it since i haven't tried it.

Honestly, in the long run it's much cheaper for you to buy a $65 ish 8k/coticule and a $25 hanging strop.