Sorry, I don't know anything about using a secondary air tank, but if you decide to purchase an airbrush compressor, Harbor Freight (if you have one nearby) has an ad that expires on February 25 for their 1/8 hp, 40 psi oilless airbrush compressor on sale for $59.99 (reg. price $79.99). I've got the 100 psi model, but many people on the board have this 40 psi model and love it. The lot number is 93657.
Colleen
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