Cindy (and Linda),

I also used a scuba tank for airbrush for many years. I purchased
the regulator at a local welding shop, and refilled the tank there
periodically. For me, a tank lasted until a lapse of memory struck,
and I forgot to close the main valve between the tank and regulator
when I was finished. A slow leak would then finish off the tank
before my next drawing session!

Good luck-

David

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David S. Goodsell                        The Scripps Research Institute
Assistant Member                        Department of Molecular Biology
                                             10666 N. Torrey Pines Road
(619) 784-2839 tel                                  La Jolla, CA  92037
(619) 784-6860 fax
[log in to unmask]                http://www.scripps.edu/pub/goodsell
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