Belt dressing is designed for belts that are exposed to dry rot (early tractors) and belts that would squeal in a car from glazing/over heating. Haven't ever even thought of using it on a kart or buggy since the belts and adhesives bonding the bias plies are made so much better than the ones we had back when. I can't see where it would hurt. Don't know if significant longevity would be achieved, since wear is on the sides and the belt just becomes too narrow to grip properly then over heats causing delamination,then breakage.
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