I'm not flying yet, but the resin system used in my aircraft is impervious to ethanol.  I'm building a Glasair, and the resin system is a Dow 411-45 vinyl-ester resin system.  The vinyl-esters were originally designed for making fiberglass underground gas tanks. All Glasairs have a integral gas tank in the forward part of the wing.

However, be cautious about using any vinyl-ester or polyester resin system over epoxy.  It won't stick.


Best Regards,

Steve
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On Sep 16, 2007, at 12:41 PM, James Maher wrote:

Is there anyone in this group who is running Mogas with ethanol exclusively and also has
fiberglass fuel tank(s)?
If anyone fits this profile and their tanks are holding up and not leaking or softening please respond with what type of resin system was used.
I used the Aeropoxy brand epoxy and this did not hold up.
I am looking for an alternative.
Thanks,
Jim