So I see what you are saying is even with the same amount of foam inside the
sheet metal (whaver the tanks are made out of) is still probably would
condense and freeze water, right? so is the foam (my only plausable
experience is a coozi popcan holder) has a durable vynl coating, or else
where it is worn off holds a lot of condensation. I assume since the foam
is not covered it is now (at time of launch) full of ice and or water?


Andromeda et Julie enlightened us with:
--
Gareth Slee

Better: A system like one used in building isolation. It's a
sandwich system with the foam between two sheets of metal.

the security problem is not the foam itself but the ice building