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Leather is used prior to shaving.
A quick visit to leather after shaving is optional.

Canvas is not strictly necessary, yet it seems to unfold crumpled
bits from a dull razor and make the blade...

Abrasive pastes no.
Perhaps strop dressing (leather conditioner).

Most folk reserve pasted strops for the last
steps in honing a razor. A very light application
of CrOx on the back of some...