I've heard of a handfull of glazes are formulated just right for use on rubber with outstanding results. The idea of glaze as a rubber treatment shouldn't be that difficult to unbderstand. Some glaze are cleaner and polisher in one package. So the benefits a\of cleaners, mild abrasives, and oils should easily be the best way to replenish rubber. Product wise, I think its going to be trial and error until the perfect one is found. Maybe some of you readers have names of glazes made for this particular purpose???