Two part epoxy comes in different formulas, JB weld is good but there are better, but not in a small tube form. More info on the project would help. I use two part epoxy on boat builds, you will destroy the parts before it comes apart at the joint,,,gregg
I've successfully used the JB Weld Industrial (bigger package) to re-attach fiberglass body panels to metal struts on my coach. Held up fine for at least a couple years (still ok when I sold it). I've also used Sikaflex glass-to-metal adhesives for similar problems.
X's Two on West Systems
.It is the best there is. I do a lot of epoxy work and won't use anything else.
Also their G-flex epoxy will adhere to anything including plastic.
Give them a call and they will walk you through your project.