after the comments above it was interesting to read and article in Old Cars Weekly a week or so ago. It discussed POR15 in gas tanks and the conclusion in this article leaned to it being good stuff. It also listed, but I can't remember what it was, as to why Por15 doesn't crack or peel inside a gas tank. Did anyone else read/see this article?? As I mentioned earlier mine is still looking good after 8 or 9 years.