Father-Son 1974 Duster Project

Wanted to ask y'all what you would use to glue this sail panel?
I'm going to run fiberglass reinforcing mesh on the back. I think eurethane over the fiberglass tape would be strong.
Latex filler to dress up and fill as needed on the finished side.
Let's hear suggestions.
View attachment 1715035281
I tried something like that on passenger side plastic top of the door panel and the cracks opened up again. I think I used plastic epoxy :( :BangHead: