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On the pasted strop do 20 and 20 see how that works. You can always repeat. On the plain strop I do 30 trips before I shave. Just my 2 cents.:D

The unpasted strop will not sharpen a dull razor for that you will need either the pasted strops or the hone. As for the pastes use the red and then the black. I use the pasted strop to brighten up...