You can use gel paste colors and mix them with high-% clear alcohol (e.g. strong vodka, everclear) or lemon extract (it's clear and has a high alcohol content). Paints right on. Needs to be alcohol because the liquid evaporates off rather quickly. Higher % alcohol=faster evaporation, less sogginess to whatever you're painting on.
I just noticed that was you 
I'm gonna assume the answer is yes and I'll answer you over there 
Luster dust and lemon juice or vodka can be painted on as well. Best of luck to you
I use gel colors and luster dust with vodka and I love how much it resembles regular old watercolors. YAY!
I actually prefer to use airbrush colors since they are already in liquid form and are easier to blend, etc. I have a little one ounce dropper/bottle filled with vodka for diluting...........this is not to be confused with the one gallon bottle of vodka used for dealing with the kids until it's time for them to go back to school. 
I actually prefer to use since they are already in liquid form and are easier to blend, etc.
I agree. I used it on the skate board cake I did and the spots on my cow. It is already ready to go, no need to thin down.
Describe what it did to the cake. Maybe if we see of here what it did we can help you decorate around it. That is my favorite part of cakes you can always cover a mistake. I have used both BC and Fondant. I am particular to fondant because it is smooth and my BC icing skills are still something I need to work on. 
A tip- Any flaw in the icing or fondant show up when you airbrush or so I have found. But you can use this to your advantage too. You can create deptha nd dimension by purposly applying indentions and designs so that they show when you do airbrush. Lemons to lemonade so to speak.
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