I have tried several different "recommended" adhesives on door panels. Some never worked and most let go within a few months. The last one was Lokweld Heat Resistant Contact Adhesive. It was inexpensive (I paid $17.96[US] for 1 quart including shipping) , easy to apply (I brushed it on) and it has lasted through an extremely hot summer. The only negative was its very strong smell, but that went away in a day or so. It is listed on Amazon.ca,(https://www.amazon.ca/Lokweld-Heat-R...ntact+Adhesive)but is "Currently Unavailable"
If you can find it in Canada I suggest that you try it.