Ed, I looked up the info on the gas tank sealer. It was provided to me from a friend in Grand Rapids, Michigan, who's employer owns the Miami Heat basketball team and the farm team for the Detroit Red Ring Hockey team and has a very large collection of both vintage and contemporary sports cars. I have been working with him on a vintage Mercedes Gull Wing hood restoration. It is called Phenol Novolac Epoxy from Caswell. I have not used it before, but my friend mentioned that they have been using it for several years with no issues. Here is a link.
http://www.caswellplating.com/epoxy-...nk-sealer.html