The compressor is what you have to worry about. Too much pressure and you will blow holes in your frosting.
That means I'd have to make a lot of SpongeBob Sq. Pants for people to NOT be suspicious about their holey cakes. LOL!
but you can adjust the pressure you use in your compressor. I bought a small compressor from the hardware store and i just played with it to find out what worked for me....i say go for it.
I say go for it!! Keep the receipt incase it isn't what you want, and return it=) Never hurts to try and get a good bargin on something you want 
I would love to hear about how this works out I might go out and buy one
I heard that you can buy a can of compressed air with a jar attachment from Home Depot. Apparently you put your color in the jar to spray. I'm not exactly sure, an instructor of mine was telling us about it. Anyway, if anyone has tried this method, I'd love to hear about it! Not ready to splurge on an airbrush yet!
Hiya guys, hey peeps hun, those canned air thingees use propellents that you really don't want on yer edible stuff. I think they sell cans of compressed air especially for using on edible things. I can't remember exactly where online you can get them.
Well you are in Jersey so you might be able to find some place close by that you can get those at.
Yea, I know that the compressed air cans do have chemicals in them. that's not what I'm talking about. It is a can of air that has a jar attached to it that's all I know. Not the kind that you use to clean your computer with...And, apparently they work well. That's why I was asking someone who may know what I'm talking about.
O ok, never mind my bad.
(sssshhhh, bad chappy, bad chappy!!!)
K, just to clarify, yes, peeps, I do know what you are talking about, I have seen Duff use them often, especially when he is on the road. But, unless the canister of air (no I am not talking about the computer duster) is specifically for food use, it will have the chemical propellents that are toxic.
Ok, I just got off the phone with MAX (makers of "dust-off) and Paasche
I asked the rep at MAX about toxicity and the were adamant that they had no food safe or non-toxic propellents in their products. While on the other hand, Paasche has two different products that are non-toxic compressed air. They are relatively expensive and you cannot control the pressure.
The gentleman I talked to informed me that they do have discounted set-ups (cosmetic damage to them) for 40-50% off the regular price.
I tend to agree with the gentleman I talked too about the cost in the long run of buying the canisters of air or using a compressor. The compressor being the more judicious purchase as it is a one time event and you are more able to control the pressure as more than 15 p.s.i. will blow your frosting right off of your cake. 10 p.s.i. is ideal for cake decorating and they do sell those on their site (the compressors and guns that is).
Here is a link to the page http://www.paascheairbrush.com/compressors_propellant.html
To answer the first posters question though, airbrush guns are pretty much interchangeable with whatever compressor you are using. Just make sure that you get a compressor that either is 15 p.s.i. max or lower or one that has a regulator valve on it.
I do hope that I have gotten things cleared up.
Can I go back to "hick-speak" now????
p.s. I have even seen some people use aquarium air pumps for their airbrushes. They seem to work just fine and the air pressure is fairly low to begin with. I personally, wouldn't get a small one but a mid-range sized one would work I think. They are quite inexpensive and if it doesn't work for the airbrush just hook it up to the fish tank. LOL!!!
They sell in the craft dept of the hardware stores cheap (ok to try before you buy the more expensive ones) They are usually bottom cup type airbrushes. Or you could go to wallymart n get the ones they have in the model car section which should be next to the compressors.
Usually the ones you find there will be the ones that have the screw on container for the paint and the jet of air blows across the little nozzle of the jar.
There aren't any needles involved. Kinda like those blow pens that crayola makes. I just saw some the other day at ACE hardware. didn't see any compressors there though.
Having recently been to Home Depot and checking out air compressors there, I can tell you this: get out of the store; you don't want ANY of those.
Hardware stores usually only carry compressors for air-powered tools, etc., which use a LOT more pressure than anything you'd use for an airbrush.
To put it into some perspective: a typical airbrush compressor is about 1/8 HP, whereas air-power tool compressor range anywhere from 2 to 8 HP.
As far as air pressure is concerned, anything above 15 psi would work wonders if your plan is to decorate the walls with the icing that used to be on the cake.... Home Depot compressors? Up to 180 psi.
You get the picture.
Kopykake makes a compressor-airbrush combo specifically for cake decorating, but it's pricey. Paasche and Badger are good brands, too.
I recently came across one from Testors (The makers of Aztek airbrushes, too). It's called the Blue Ice Mini Compressor, which I've found on Ebay new for around $35.- The reviewers have rated this poorly, as they claim it has too little pressure for their paint, but isn't that what you'd want for icing? Plus, I find that 35 bucks are easier to part with than 200, especially when it's to experiment.
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