Really, what contact area will you have? Get two tanks, get another tank, whatever....

At the $'s/oz that were listed below, you'll spend more than just buying a real tank that works.

You'll be sorry with soaking your beautiful boat with diesel, then you'll be using baby oil/soap or asking for any other "great" ideas to get the smell out or clean the stains, etc. That's assuming something doesn't catch fire.