Just tried airbrushing Xtracrylix for the first time on my Eurofighter, and it didn't go very well. The airframe is preshaded with enamel (a month or so ago, so it's well and truly cured) and has been wet sanded overall, so there can't be any release agent left. Using Barley Grey overall, it just didn't seem to want to "take", and shrank into blobs all over the surface, until I overloaded it to the point where the whole aircraft was wet, and puddling! Fortunately, I nipped indoors and ran it under the hot tap, and the whole lot washed straight off again, so no permanent harm done, but I must be doing something VERY wrong... I thinned with screen wash as usual with acrylics -- could that be it? Do you have to use special Xtracrylix thinner?
Any ideas would be much appreciated, and I've learned my lesson about experimenting first.