Roy wrote:

I just have a queasy feeling on using freon tanks as portable air
storage containers. They are pretty thin to begin with, and after some
use will get moisture inside.

I, too, prefer propane tanks rather than freon but any tank will
accumulate water over many refillings unless you use pretty dry air.
Comming of my compressor tank, I have two conventional moisture traps to
the general shop lines. From there I go through a coalescing filter for
air to my plasma cutter. It is this I use for refilling my air pig.

Ted