Water in Fuel Tank!

[Chester]

My sources say fiberglass is a poor fuel tank construction material even for non ethanol fuel. Anybody have information supporting that theory?

To a large degree the suitability of fiberglass tanks depends on the type of resin used in their construction.
I've heard ethanol attacks most (all?) polyester and some vinylester and epoxy resins.
Other fuels have compatability issues as well.
How could you tell a fiberglass tank is deteriorating before it becomes dangerous?