Has anyone mixed petal dust with vodka for use in the airbrush ? Just wondering how much petal dust to how much vodka ? Do I use the whole container of petal dust and mix with a nip bottle or is that too much ?

I've used pearl or luster dust with the airbrush, but not the petal. I mix it with everclear. I don't have a ratio for you, but for the airbrush you really want a thin mixture, even if you have to go over it a few times, because if it isn't thin it could clump and clug up the airbrush.