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Before I answer, I want to clarify that I'm recommending strop dressing and not paste since they are two different products. Dressing for conditioning and pastes for abrading or sharpening.

Now...

You don't have to break in a strop. Just using it daily will naturally break it in. But, using the methods I described will help it break-in (and strop better in my opinion) faster than just daily...

Rub some strop dressing into the leather with your fingers and palm.

Take a straight sided glass bottle, such as an empty beer bottle, (any applied labels removed) pull the dressed strop out...