Back when I was youngster I worked some summers and after school at a
full service Mobil station. When we would do an oil and filter change, we had a squirt type oil can filled with a product named Ru-Glyde that was a rubber lubricant and mostly used on the tire changing machine. During the oil service process, we would squirt/rub in some Ru-Glyde on the rubber bushings and wipe it around the door seals. It seemed to keep the rubber bushings in good shape and certainly help remove any squeeking that was so common with the 60s cars.
So today I've been looking for a rubber conditioner, to use on the door seals, and possibly on the bushings. I see Ru-Glyde is still being made and sold at NAPA. I also see a product named Gummi Pflege being recommended on some german car forums.
I see American Grease Stick (RuGlyde maker) also has a product named Sil-Glyde
http://www.agscompany.com/lubricants/automotive/168
Does anyone have a recommendation for a general purpose rubber seal, bushing, grommet, conditioner?