Fiberglass siding delaminating. Fix?

[timmosazz]

I have a 92 Vacationer cab over camper with fiberglass siding. I have checked for water leaks and am sure there are no leaks. I believe this is a heat expansion problem. I think the fiberglass is glued to Styrofoam. Does this sound right? I know that Styrofoam reacts to certain chemicals and i am thinking of injecting glue to fix the problem. Does anybody know what type of glue i should use? Or has anybody had this problem and come up with a fix? I would call the manufacture but they are no more. Otherwise the camper is solid.

["007"]

Welcome tommosazz to irv2.
Most fiberglass is glued to a plywood backing. The age of your camper sealants maybe dried out under moldings and seams on roof and seal around a window. Water will travel to where you see it exposed on interior of your coach.
Where exactly is the leak showing up?

[timmosazz]

Sorry so long to reply. It is happening above window at the sink. I don't think it got wet. I think the problem is from intence heat . We have 100 deg plus days throughout the summer, and it is on the side that gets the most sun. I keep the camper coverd with one of those breathable waterproof camper covers. Like i said i think it is from the heat all that expanding and contracting and like you said old glue. I dug a little deeper and you were right it is plywood. So what kind of adhesive should i use?

["007"]

I guess you will have your pick with this LINK. The glue for Marine purposes may prove to be the best. Check with a Marine Supply they can help with questions.
I have use Marine Sealants and have work real well.