I guess i am old fashioned but i just paint the inside of the tank compartment and engine area prior to covering with SIG Dope and add a 3/16 drain hole. I use 2 or 3 coats with a wide brush and have never had a problem with fuel soaking. I even had a tank burst with no bad effects a long time ago. I had a bad experience with epoxy coming off when fuel got on it but i am sure it was something I did wrong... The Black SIG Dope ends up looking pretty good in the engine comaprtment but watch the fumes!!! whoa!