Hey Ran the man, I did a little checking around and from what I understand the procedure isn't much different from how you normally would do it, apparently createx colours are suitable fro leather and vinyl without the need for special base coats, they do however stress that the surface should be cleaned and light scuffed with 500 grade sandpaper or abrasive, and that the paint should be applied in very thins layers to avoid cracking while drying.
There are also special paints available for airbrushing on these surfaces the first link here is a paint made by an Australian company, I'm very sure our friend Ace will chip in here because there is a thread on his beautiful forum in the subject, and I think this something he will surely know, like I keep saying, he aint called Ace for nuthin.
The second link is a createx data brochure.
http://www.viponds.com.au/airbrush.htm
http://www.createxcolors.com/product/airbrushcolors/CreatexAirbrushColors.pdf
Hope this ha enlightened you a little, and remember my very good friend, I google so you don't have to.
P.S. the answer to your actual question (in my case) is no.