"Doug" wrote: ummmm, so does propane not impregnate steel????
i KNOW gasoline does to where the methods mentioned will make a large bang.
^^^^^^^^^^^^^^^^
Neither gasoline nor propane impregnates steel. The reason gasoline tanks
are dangerous is that the fuel lurks in crevices and seams, and is hard to
get rid of. A propane tank would not have this problem if properly
ventilated for two reasons:

1.) It is a gas at atmospheric pressure and room temperature, so hardly any
could reside in a seam.
2.) A propane tank has no seams.