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here is some good instructions from fellow member Neil Miller whom sells the crox powder where i purchase mine from
Chrome Oxide Powder - 5g

Just sprinkle it straight onto the strop. It will stick. Then rub it in with a rag, I use a powder as well

Where did you get it? Some of them aren't of great quality.

Just sprinkle it on a spare strop and rub it in with a rag. It will stick to anything.