1 bayouboy makes a good point. Fumes would definitely be dangerous to catestrophic!
You might be interested in this. I came across it a few weeks ago and it sounds too good to be true, so beware. It could be something you'd appreciate knowing about though.
http://www.aluminumrepair.com/more_info.asp
Also, you might want to check out;
http://www.yachtsurvey.com/fueltank.htm