I tried to epoxy this and it held for half a day. Honda odyssey 2006 plastic seems anti adhesive. Heat gun?
I could try putting duct tape from behind and epoxy it again. I didn't clean it with alcohol, but fast epoxy didn't work at all.Don't know how hard it would be to take the panel off and epoxy and some tape from behind, let it cure and put it back? Or maybe try some slow cure epoxy which is more flexible?
Duct tape keeps the world together....
You can use nail polish remover for a prep, it is acetone based. Be careful it eats the plastic surface. Then my favorite is JB weld epoxy. They have the fast stuff, but I like the overnight cure. It can be filed or sanded down. Some touch paint, might look ok.To prevent the crack from spreading, at the end of the crack drill a small round hole.
Is everything on the door panel attached properly, as something is putting a stress on that section of the panel.
Of note, some plastics are kind of 'funny' and waxy, making it hard for glue to stick.