I have a leather strop that had been covered with some chromium oxide (looked like a crayon.) The green stuff is flaking off in big chunks. Should I stop this from happening? How? Or, should I just let it fall off and then apply more? The whole thing looks dry. Should I add a little mineral oil to the surface? I only use it right after I'm done sharpening (which is not that often.) Just curious, could a leather strop be used for honing or is it not abrasive enough and best kept for polishing?