Gasohol and tank sealants / fibreglass tanks

Craig380 · Post by **Craig380** » Sat Oct 24, 2009 9:14 am

Hi all,

this article: http://www.rjmclassic.com/bulletins.html has been posted on a couple of UK classic bike forums.

It says that gas with ethanol (5% or higher) causes problems with fibreglass tanks and sealants.

I believe most gas in the US has ethanol, correct? Have you guys experienced any problems with tank sealants, etc?

cheers, Craig

tz375 · Post by **tz375** » Sat Oct 24, 2009 2:30 pm

Craig,

I can confirm that ethanol in fuel will cause some of the resin to leach out with the fuel and it will coat the intake and valves with a sticky goo that leads to bent valves (obviously that relates to 4 strokes).

I have not tried a sealer but I hear that POR works well and is not affected by the ethanol.

The only issue i see is allowing the ethanol time to come back out of the glass matrix before it is sealed.

debby · Post by **debby** » Sun Oct 25, 2009 10:02 am

Caswell epoxy is the way to go for fiberglass tanks.

Debby

Coyote · Post by **Coyote** » Sun Oct 25, 2009 5:34 pm

I believe most gas in the US has ethanol, correct?

Craig, that's true to a certain percentage of stations. I'd say around 90% or so. Here in the central US there are several stations where you can still get ethanol free gas. It generally runs 20 t0 25 cents per gallon more than the ethanol crap. There is an ethanol free gas station just 3 miles from home.

ja-moo · Post by **ja-moo** » Mon Oct 26, 2009 1:08 pm

Por-15 and KBS both work on sealing fiberglass tanks.