I ended up using unthinned black paint in the gun, set at 40psi with nozzle fan opened right out and paint needle screwed open too. The gun then spits out a web as you move along which just lays on the surface, which I ended up sealing down by applying a couple of coats of clear. I would suggest practicing on some white cardboard or plastic playing around with the gun before letting loose on your cabinet.
There is a little more info and some pics in this thread:
http://aussiepinball.com/index.php?topic=6311.0
