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I got mine at Japaneseknifesharpening.com, which is associated with D.R. Sharpening, when I was ordering some knife stuff. I think you can get it at most woodworking-oriented stores ( like Rockler)...

I generally use Maas paste for polishing razors that I get in a condition that necessitates polish, and that seems to work fine as a protectant... but I am a little wary of shaving regularly with...