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I find that WD-40 lubricates the blade better than water and helps keep the sandpaper free of the metal build up that I get when using dry sandpaper.
On some blades I have also used emery cloth,...

On the last blade I restored (Wade & Butcher 4/8 wedge) I used wet & dry with WD-40 as lubricant up to 2k then micromesh with water up to 6k.
After that I buffed it with tripoli and then green...