If your tank is steel I got turned onto a product called red coat. A guy that I know that works in a jet engine factory told me this is what is used in planes. I got it off eBay for about $25 a quart and it worked great on my gas tank I built. I'm not sure about ethanol exposure though. 3oz. of Amsoil 2 stroke oil per gallon for your pre-mix is what I run in my sled motors. It probably has the snowmobile jetting in it still so you may need to re-jet it. I would watch that closely at first regardless, who knows what was done to it. It would be a shame to burn up a motor to lean jetting.
