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Just to let all know a bit more about the scuba tanks since I'm a diver also.. Scuba tanks are filled with highly filterd air and is VERY dry, moisture is removed thru the tank refilling process with high end dive tank compressors. I have never heard of any vegetable oil being used in the process though. (Imagine any liability for putting something in someones brathing air..it just isn't done) When diving you actually get a very dry mouth because of this. The air has to be dry as not to cause any rust/corrosion INSIDE the dive tanks so I don't think there is any issue with moisture for using dive tank air for dusting. Remember if planning on buying a dive tank for this...dive shops will fill a tank (or supposed to) for only certified divers for safety reasons. You'd be quite lucky to get if filled if not 'certified yourself'...or have someone do it for you. You CAN get a valve to fill it yourself with conventional compressors, but not recommended because you will probably get moisture INSIDE it and create more problems yourself. Dive tanks need to be inspeceted each year (VIP) or they wont fill them. $15.00 Every 5 years they need a HYDRO test to make sure they can be pumped up to 3000psi and not blow up if bad. $25.00 With any release of compressed air from a tank at high rates does cause condensation inside that is why air compressor tanks have a blead valve on the main tank. But using a dive tank to dust off at small bursts shouldn't cause any problem..I'have used them to fill up air mattresses with no problems. Has anyone thought the CHEAPER route of just getting a PORTABLE air tank like you use to fill up a tire? Just fill it up at any service station and you're on the way. Dive tanks are HEAVY!!! Go to any auto parts store, K-mart etc to find one. (Thats what I'd do) If worried about the purity of the air, just install a filter in your hose on the way out to trap any moisture/contamination like most quality air compressors use. I have them on my photo lab compressor as not to blow out any water that may form in the condensation process..... - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.