I have brought some rubber seal parts on a car back to life. These were rubber, not weather strip, but rubber seals in a couple places around the window of an older car. The parts had some paint overspray on them. I took the part off and brushed a little aircraft paint stripper on them. Let them sit in a pie tin for a while. This is the nasty methylene chloride stuff that is gradually going away. Much to my surprise, not only did the paint come off, but the parts seemed much more pliable.

Collects Dino era Sinclair & Mopar items