Originally Posted by LasseNC
There aren't really any problems with fibertanks over here, only due to vibration.
There might be some marine coating I can use. Epoxy can get thick too, it that even matters.
There is I think a French made marine epoxy which has been designed to work with Efuels, and this might work better as a sealer than the very thin products such as Caswells which seem to have been diluted 50-60% over the base epoxy resin used simply to increase profits.
Way to seal a tank is to start with a relatively thick epoxy and thin this down using heat, and apply to inside of your tank while its still thin enough to cover properly. If you do 2 applications this way then you will have a much better hope of avoiding the problems which would result by using something like Caswell.
I will find details of the French resin and post them later. Also worth checking if the super unleaded fuel you can get in Denmark is ethanol free (some of that sold here in the UK has no ethanol).