I would need to see the damaged area, but I have 2 adhesives that MIGHT work. One is specifically for mounting rubber gaskets, the other GOOP is a very good clear contact glue that I have had good luck with. PS My background, I have rebuilt 8 early Mustangs from the ground up, including uninstalling all the gaskets around doors, trunk, etc.
Send me a PM if you are interested.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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