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You will need to occasionally lap the lapping stone.

Is this the poor mans strop kit?
0.1 micron iron oxide, powder, tablespoonful
0.3 micron chromium oxide, powder, tablespoonful

I would do 5 light strokes on the pasted balsa(remember stropping motion). Then go to your unpasted leather strop. I think 20 may be on the low side. See if you can manage 40-60. Do not worry...

Which pastes come in the kit?

But basically, i am going to assume green chromium oxide is one of them, you use a stropping motion with a light touch. I would do 5 strokes, test. Needs more,...