I use Brodak dope to attach Sig Koverall, then I will be painting with latex house paint. To keep latex house paint fuel proof you have to put a clear coat. I personally don't like silkspan since it's not as durable as I would like. I have dropped screw drivers on the koverall without any holes. The Sig koverall is on the heavy side...

Model airplane news has a good on line article on how to paint with latex house paint, a nice way to go. Much less expensive and you can get any custom color mixed at your local home depot or Lowes.

Good luck!