Hi there

I'm relatively new to using composites and not familiar with the different types of resins available. I am looking to make fiber glass petrol tanks for competition motorcycles. There are a lot of people already using these on the Pre65 Trials circuit but in the last few years a lot of them have started to delaminate and bubble. Additionally the resin has been clogging up the carburettors. This is attributed to the Ethanol in modern fuels.

Is there a resin available that is resistant to ethanol even at the quantities used in E85 which has yet to reach our shores.

Many thanks

Steve

Hi there I to have just finished making carbon tank with Kevlar before I bond the parts together I will seal the tank,like you I've been looking for the right resin system but ethanol eats epoxy over time check out novalac tank sealer it says ethanol resistence,but it's very thixotropix so so don't think you can laminate with it,I already built my tank pieces,because I have peel ply finish should be able to brush on.be interested how you get on I can't 

Many thanks for the advice. I was really hoping to laminate with it but I might have to settle for a coating. There have ben similar issues with some of these tank sealers but there is one on the market that everybody seems to swear by. I'll have to research it further and get back to you. If you haven't glued the 2 halves of your tank together yet, have you thought about having a flexible bladder made for it out of Viton or similar. This is what I was going to do but for the number of tanks I want to make of one shape this would be cost restricitve. However, if you've gone to the trouble of making a carbon fibre tank you might be happy with the cost. I can supply details of a good manufacturer if you want it.