OK, I have a set of Naniwa hones (1k, 5k, 8k, 12k) and I'm learning to hone. I don't plan on becoming a honing service I just want to be able to hone my razors and the razors I restore.

So here's the questions...

In doing restorations is there I time where I would need a hone below 1k grit for any reason?

Is there a grit that I must add in my current collection for personal honing use?