When rubber (I don't know the specifics, but I assume it's butyl rubber) gets old, it turns into one of two states usually:
- It becomes sticky and gummy.
- It becomes hard and brittle.
I'd like to know if there's a way to change hardened or sticky rubber back into its original condition. The only thing I tried so far, is heating it up gently with a hot air gun to ~60°C which makes hard rubber more malleable.
I understand there are different kinds of synthetic rubbers, made of different polymers, and henceforth, there might be a range of chemicals that might be used to treat those various kinds. I couldn't find any information on such "pairings", for instance I was searching specifically to treat butyl rubber, but I couldn't find anything.
The air ducting in cars is made of some sort of hard rubber (I'm not sure what kind of polymer), and I've heard that Ballistol can be used to soften it, but it's hearsay, essentially, I'm not sure about that.
I'm not looking for a way to completely "rejuvenate" rubber parts like that, just to have them restored a bit, so they are easier to work with.
Same thing with sticky rubber. Is there a way to make it less sticky?