Fuel tanks

Anyone know what the H3 Fueltank is made out off?

Polymer, fiberglass, metal?

With the E-10 gasoline approved by the EPA, there is an issue present that will become more crucial as the Ethanol level is increased. Ie; E-70

Fiberglass is broken down by ethanol, so we don't want these tanks.

There is a marine fuel additive called Star Brite Brand, Startron Fuel Enzyme Treatment, that is used to keep water that may become mixed into the fuel tank from seperating the ethanol.
Apparantly, water when mixed into E-10 gasoline, will seperate the etanol from the gasoline and cause it to sink to the bottom of the tank along with the water as a seperate level; Hence being pulled into the fuel line and cause major problems with the ignition system. Not to mention the gasoline stays on top preventing the motor from getting the good stuff so to speak.

I read this and was told it by a mechanic too, but have no experience or authority on it.

I was curious as to anyones thoughts or experience with this as the Startron, is an enzyme that may also effect the integrity of the tank.