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All of my razors (32 of them). You just have to pay attention to how you strop. They will tell you when they have had enough. It's a certain sound they make and it's hard to describe. But, you'll...

I can't say for denim, but I personally have made a paddle strop with canvas on one side (with CrOx) and leather on the other side. It worked out well. Go light on the CrOx! Less is more.