There is no reason why not. I use watered down gel colors when I am out of airbrush colors. They work in a pinch. I will probably try vodka next time, I had never thought of it. But I use vodka with pearl dust, and spray it.
I always use gel colors with vodka. I make it up using some empty flavoring bottles. It helps to make the colors before you need and let them sit awhile that way all the gel dissolves completely and I immediately flush the airbrush when I'm done. I've had no problems.
What exactly does it do? Make the colors hold, or make them brighter?
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