imported post
I would use "5 minute Epoxy" on the inside of the truck, it comes in a big syringe and works great!
Someone on this site said they use a "Black Epoxy" (syringe type) to match the color, I've never seen Black in the States or Canada but you can ask?
Can use "Fiber Glass" , but unless you're an expert with it , it's a mess and tricky to apply!