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Anything in particular I should know, that you normally wouldn't unless you talk to other airbrush users? I don't surprises. Example: do certain airbrush guns only go to certain compressors and shit like that.
Also, what brands are good and reliable?
You can use any size compressor for an airbrush - even as small as one gallon. Airbrushes don't use that much air at a time that nearly any compressor can't keep up with - unless you are using a large gun-type that spits out more than 4 cfpm! Don't let a salesman convince you that you need a 10 gallon tank - unless you are going to use it to spray paint your house or car! As long as you can adjust the PSI, you are fine. Also, there are some compressors out there that need to be monitored and filled with oil, but there are so many cheap maintenance free ones that will last forever - just remember to ALWAYS release the air from the tank and drain the moisture from the bottom valve when you are finished - otherwise, the inside of your tank will rust.
I have used very expensive silent airbrush compressors and cheap air tool compressors - both shoot the paint out the same. Just make sure it is the type of compressor that has an air storage tank and is not just a compressor that blows air - like to inflate a tire. You can find a tank compressor at a hardware store. Just need to get the hose connector, which most all have standard sizes. You just might need to get a reducer/adaptor to fit the hose to the compressor, but these are cheap and you can get them where you get your compressor.
MDSW's right on all counts. If you do go for a "regular" compressor, shoot for something with a 2 to 3 gallon tank, tops. Any bigger and it's useless overkill, any smaller and the motor runs all the time because there's not enough stored air in the tiny tank.