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Gerald's points about moisture are well made, but I must point out that the oxygen content of the air has little to do with the moisture content - air is mostly nitrogen (78%). You can have a tank of "pure" nitrogen gas and still have a major water moisture problem - I have encountered this too often in the lab! I don't want to go into a chemistry lecture(actually, physics as this is a physical, not chemical effect - but I teach college chemistry) about the problem here, but DO want to point out that you can have moisture problems if you buy ANY tanked gas to paint with - UNLESS the supplier has stated on the tank that the gas is "dry" ! Like gunpowder, keep it dry - and happy painting ! And ALWAYS use a fume hood (ok, "spray booth" for the non-chemist) - you do NOT want to go into the biochemistry of what breathing in the organics and particulates can do to you - NOR do you want to experiance it !!!! - George
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