permanently, or just a hella long time

3M Black Super Weatherstrip and Gasket Adhesive, it works. Any auto parts store sells the glue. Amazon has a link.

https://www.amazon.com/3M-08008-Black-Weatherstrip-Adhesive/dp/B00063X38M

Get yourself some weatherstrip adhesive.

https://www.3m.com/3M/en_US/p/d/b40069430/

https://www.amazon.com/3M-08008-Black-Weatherstrip-Adhesive/dp/B00063X38M

If the weatherstrip needs to be softened up due to cold weather, I'd suggest using a heatgun or hairdryer and do the repair indoors, if possible.

3M Black Super Weatherstrip and Gasket Adhesive, 08008, 5 fl oz. Any auto parts store sells it. Amazon has it as well. Link below. It works

https://www.amazon.com/3M-08008-Black-Weatherstrip-Adhesive/dp/B00063X38M

Any auto parts store. Amazon link for example.https://www.amazon.com/3M-08008-Black-Weatherstrip-Adhesive/dp/B00063X38M

Did you check out the video? Diagnosing a leak starts half way through.