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You could. You could also get a piece of scrap leather and just experiment with the stuff before you paste a long hanging strop. I say that because it is easy to put the stuff on but hard to take it...

If you can hone well the 4/8 will give you a good comfortable shaving edge. When you can consistently get that with the 8k a 12k is a nice thing to get a bit smoother.

For the stropping question,...