I've just bought an Aztek A4709 airbrush, which I'll be using to paint 1:35 scale armour. The airbrush instructions state that the compressor should be set to 20-28psi (1.4 to 1.8 bar). I knew we already had an old compressor buried somewhere (my wife used it for spraying glaze onto pottery) and I found it after much rummaging in the shed. However, I find that it's rated at 3.5 to 4 bar (with no adjustment) - it was used with a pretty heavy-duty looking spray gun. So, I'm assuming that hooking the Aztek up to this will result in less than desirable results. Does anyone know if I'll be risking the internals of the Aztek if I hook it up and try it out? Or should I just play safe and go shopping for a more appropriate compressor?