[Paddlewise] insulating a fiberglass truck-cap

I've got this friend who is an avid white-water paddler and
who has a fiberglass truck-cap.  They spend a LOT of time in
their truck (virtually a home-on-wheels) and have tried at various
times with various glues to apply some sort of foam insulation to
the inside surface of the truck-cap.  Either the stuff comes loose
on the first really HOT day, or on the coldest COLD day.  So far
they haven't found anything that will consistently hold in all
temperature extremes.

I imagine with the wealth of knowledge available on this list, that
at least one or more people will have some ideas about how to 
best insulate this truck-cap so as to make life within more 
comfortable for my friend.

neal_at_bellhow.com
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