When I worked at the grocery store bakery I HATED airbrushing whipped icing. I don't recall having issues with bleeding just issues period. When someone requested this type of icing for a design that required air brushing I always tried to talk them into buttercream instead or changing their design. 
I airbrush them all the time, the only thing I've ever noticed is that they take MORE color to get darker colors.......once it sits overnight it seems like the color lightens up quite a bit.
Here is a cake iced with Rich's bettercreme.....you don't have to refrigerate the cake unless your filling is perishable
Thank you, KHalsteed. I was concerned about airbrushing a whipped cake but now I feel confident. I'll let you know how it comes out.
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