I use clean new belts at about 220, the leather will be a little fuzzy. Don't worry, just so log as the surface is free of metal. The white compound is the best for me because you can tell right away if it is contaminating with the metal, etc... Try to use a compound that has less grease carrier, so the heat won't stain. The aerosol "Brake Kleen" is for automotive brake part flushing, and it degreases and dries super clean. You can touch up with a finger wrapped in emery cloth, but be careful to maintain the same finish. Beeswax will seal and protect, as well as make the surface nice. It will darken a surface a little, but not much. Dye BEFORE the beeswax, though.