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Funny you should mention that Bevan, I use metal polish, it does seem to help cut faster fro whatever reason.

It seems that 180 is the lowest wet/dry paper you can get here. Might be different up in Tokyo though, IIRC, that's roughly where Seth is located. And the regular old sandpaper at like 60grit really...

It depends how clean/shiny you want the razor to be. I have a few resto's that took 14hrs sanding on 180. Once you finish with 180 it goes a bit faster. Sometimes I leave a little discoloration, but...