I have gotten this answer before but I can't find my own post.
I am finishing a walnut project. So far:
Danish Oil - Waited
Shellac - sanded to 220
4 coats wipe-on poly
Question: Do I sand now with 150 or is this the step that I go to 400 and above?
After this I'll finish with a couple of coats of wipe-on, let it sit for a couple of weeks and polish.