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Pasting happens naturally. Once you have worn out a few strops you will understand. Your first "pasted strop will be one coated with ferrous oxide. Thats the residue your razor leaves behind on a...

+2 on what he said. You will never clean that strop. Best bet is to wipe off as much excess as you can with a cotton rag and let that be your 1st Red/Black. It's usually your 1st pasted setup anyway....