HI I'm making an upright penguin cake. I would like to airbrush the black areas (new airbrush, not used yet). I'm afraid fondant will slid off sine he is standing up. Do I need to use a certain kind of buttercream to acheive a good black coverage? Any help tips you can pass along? Will everyone have black teeth and tongues after they eat it? Thanks for your help. [email protected] 
I would play around with your airbrush a bit before you attempt the penguin so that you can get the feel of the nozzle and the spray.You probably will have to spray in light coats and then let it dry and redo.Try not to get too close to the fondant or it will spray a large glossy puddle...Also...use a piece of thin cardboard or card stock to help block off the areas you don't want black as the over spray will show.Should look great!!!
Wear a mask! Especially because you wont be holding it straight up like your supposed to the color is going to go everywhere including up your nose. I am talking form experience! I never laughed so much in the bathroom. Not to mention the next day I had an appointment with the ENT doctor.
Yeah well Paula...I went to the school on day to pick up my kids and forgot I had been airbrushing...They were all laughing at my blue nostrils...How embarassing!!!!
....I'm afraid fondant will slid off sine he is standing up....
Nope, Won't happen
....Will everyone have black teeth and tongues after they eat it?....
Yep, prolly will But much less w/airbrushing than if you made black icing!
Definately follow kiddiecakes suggestions for airbrushing.
Tint your bc grey (or use chocolate, as suggested) so you won't have to use as much spray. Also, if your bc develops any hairline cracks or other imperfections, they won't be stark white against your black background.
Definitely apply in several coats. Color will darken upon standing.
This bc cake was airbrushed black:
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