I have a C12k that has finished many of my razors in rotation.
I finish at over 100 laps & it varies with the razor, no slurry involved with my C12k at any point.
The only time I involve hair that is not on my face, is at the setting of the bevel at 1k.
If the razor does not shave arm hair smoothly at 1k, I don't move up the hones.
How did you decide that shaving arm hair after a finishing stone was beneficial?