Jerry,
I called Bob about doing crowns and he doesn't stain or Pro Fin where the crown will be. He leaves the crown area bare wood until he dips that area in crown paint, if I remember our conversation correctly.
I just stained some shafts up to a pencil mark and used Pro Fin just past that mark, after the stain dried. I have two coats of Pro Fin over the stain and last night tape off the line area and used Rustoleum white on the bare wood. I will steel wool the white and give it a second coat. Hopefully, it will be covered good enough. Cresting and final Pro Fin to cover and it should be good.
Others here use Pro Fin and may chime in. If nothing else, give Bob a call.