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What kind of airbrush do you have? If you have a bottle-fed airbrush, you can just keep it in the airbrush bottle, provided you have extra bottles lying around to continue painting. If you got a gravity-fed, I guess you could pour leftover paint into a spare bottle.
Personally, I can estimate fairly close how much paint I will need for painting certain parts, so there is very little leftover paint. If there is I don't bother saving it.
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