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After reading Miller's reply I realize that if the leather is raised by the wood not being flat or because of a (cotton) layer, sanding may not be the best solution and (too much) sanding may lead to...

You can lap the paddlestrop much like a hone but keep it dry. I think I've lapped a benchstrop I made to 400 grit sanding paper, some of the strop experts will be able to tell you which grit is best...