Yes, you can replenish the oil of the plastics with skin oil, as you are doing, though more is usually found on the side of the nose (outside) or forehead. I haven't tried synthetic oils, but a miscible oil like Armor-all or Son-of-a -gun might help. I think I also mentioned burnishing, or compressing the surface with a thumbnail, but it occurs to me that a smooth piece of bone might work even better. Don't ladies use a smooth rounded plastic tool to work on their cuticles? That might work also. I had one UH that had seen a lot of field service and most of the accent color was gone from the Staglon. I touched it up with leather shoe sole dressing dye.
Codger
