How to fix Coleman ABS Camper roof cheap 

Fiberglass mat is a very good option and waterproof, also I sprayed white flex seal over it too works great

My camper roof was warped because I stored it in a lot over the winter and spring so it has a lot of huge cracks that go all the way through the roof down to the wood. Could this technique still be used or would I have to replace the roof? It's the same material roof as the camper you worked on.

I was curious if the abs solution you use would melt the styrofoam core?

2 years later, what shape is the top in?

Also what was the purpose in grinding the crack before patching.

When done, what type of paint should I use?

( China Expandable container house ---10 minutes one house ) here is idea for your teardrop if you still have it!