If you use luster dust-don't try to paint with Wilton dusts. I've never had any luch with them working well for painting.
Yes vodka, mix the luster dust with a very little bit of vodka and then paint it on. The alcohol will evaporate off and the color from the luster dust will stay.
You can do multiple coats to get the desired metallic look. Just make sure to give it plenty of time to dry in between coats. godd luck!
I've had good luck with making a light grey fondant, then painting it with a dab of vodka in the silver luster dust. A few coats works well.
I made a racecar cake with a top tier that needed to look like a metal diamond plate pattern. I simply covered the tier with grey fondant and then airbrushed it with silver luster dust mixed with vodka and the effect came out great. You could also use a brush to paint it on if you don't have an airbrush. You can check out my photos to see the cake. It's a three tier with blue, red, and silver.
I've had the best luck with lemon extract instead of vodka. The alcohol content is way higher 
in lemon extract. Go figure. Vodka made my paint too watery.
I also had good luck, though some haven't, with the Duff cake spray at Michaels. I shook it well, and warmed it slightly while shaking over a hot burner on the stove (dh said spray paints do best if they're warm), and it did great for painting my corona bucket.
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