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Re: airbrush question
You can get a reasonable finish from the compressed air cans, you just have to vigilant of a few things.
The actual gas in the cans is CO2, then this is discharged from the can it cools rapidly, after a few moments of spraying you will notice a significant temperature drop in the feel of the can as well as the air coming out the airbrush. If you spray long enough, the air line can freeze, you will also see a decrease in viscosity of the paint you're spraying as it gets cooler.
You can counter the cooling effect by standing the can in a pail of warm water while you're spraying - warming the can will help minimise the temperature loss. Please note I say warm - you want water you would be happy to bathe a baby in, too much heat to the can will be a bad thing!
Secondly, when you use these cans, you have little to no control over the air pressure from them (it will decrease as the cans cool too!), if you're going to optimise the use of your airbrush, you really want a controllable air supply. The cans are fine for starting out, but if you wish to progress and develop better technique, you won't want to use them for too long.
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