I’ve airbrushed entire tiers before, and have airbrushed cake boards black when I’m too lazy to color the fondant. You have to be careful to get an even steady flow or you’ll get dark spots if you hover the airbrushed a second too long over one area. It works, but I have found that 1) it gives your cake a shiny look, which I’m not a fan of, and 2) the fondant never seems to fully dry, it stays a bit sticky ~ which I think might cause major problems with stenciling. If I were you, I would definitely work on a piece of practice fondant before doing this on a wedding cake.
Good luck, keep me posted on the results!
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