Thread: Using a dremel for removing black rust, pitting and polishing after handsanding.

"With great power comes great responsibility." Using any power tool requires lots of practice and even then it is still a challenge. Scraping exess then metal polish and steel wool will go a long way to freshening a blade. 3k gives a fantastic finish. I don't think I would bother going much if any beyond that.
One major word of warning: search "foiling". In a nutshell you can become so intent on removing pits that you turn a perfectly good razor into foil in the process even by hand sanding. The Kung Fu of it is to know when to quit sanding and be happy with the result.