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It turns out that the thumb nail is a lot like heavy whisker and will "catch" on a sharp
edge. Most beginners catch on a thumbnail with too much pressure and that is not good for a fine edge. ...

Yes SRD's sprays are good sprays...
I would note that 1 micron and submicron sprays are not for putting
an edge on a razor but for changing the quality of an already sharp edge.

CrOx is very...