floatation foam

I've done a far number of investigations and they all have this "spiral of errors". It doesn't matter what type of "incident", it's there as soon as you start looking into the events and time lines. The near melt down at Three Mile Island, air liner crashes, space craft explosions, ship capsizes, building collapses, you name it. Titanic helped awaken investigators and engineers to these sort of things, which broadened our understanding. Unfortunately, it had to happen, so we could advance and evolve the engineering behind the structures. It even took them a while to figure out that air craft pilots would be well served to wear a parachute, even though folks in zeppelins and balloons had been wearing them for years. No one would have taken the Morton Thiokol engineers seriously (in fact they didn't) unless the Challenger exploded. Sometimes, we hardheaded types, just refuse to heed reason, until it smacks us in the face. This is the nature of humanity, to relearn lessons, previously unlearned.

 

Why not use a Polyisocyanurate foam which is closed cell and gasoline proof?
You see it typically with foil face.
Cant imagine one better. Styrofoam would be ok except is dissolved by hydrocarbons.

http://www.fabricationspecialties.com/pdf/thermaxsheathing.pdf
I have a small piece of some I got from LOWES, so I can do a gasoline test on it and see what happens.

Here it is mentioned again the chemical resistance.
http://www.programs.insulation.org/...gory=MTL&WFID_W=116&Time=14167676&MenuKey=234

 

Epoxy foam would probably be best, though it's considerably heavier than flotation foams, it is structural and resistant.