David, perhaps I am being a bit harsh with the bad batch idea, but when you follow instructions to the letter and it doesn't work then it gets a bit irritating. I was running with 30 Psi and tried both 0.3mm and 0.5mm needles in 2 airbrushes to no avail. Anyway, I took your advice and sent an Email to them to see what they say, will report back when I get a reply.
Andy.
Andy.