Hi, just got my new compressor and airbrush and am about to paint my revell westland wessex. I have some of the model air colours and wondered what psi I should spray at. On vallejos website it says 20-25 but that seems way to high.
A lot depends on as both Barry & John mention the size of your needle nozzle. I generally keep up the pressure for .2 needle & lower for .4.
Also if you are thinning Model Air. I generally thin 25 to 40% depending on what I am airbushing. With the heat at the moment the paint goes off as it almost leaves the brush.
Best I found is to get some empty plastic bottles & practice on these for hours yes hours but it is well worth the trip. Use different settings to see the effect.
If your compressor is a tankless type I found with mine that the pressure gauge dropped from its idle position when I started using the brush & pumping air. Do not have the same with the new tank type I now have.