30 psi when spraying. As I said, I tried different consistencies. First, I started with "consistency of milk", I was able to get the enamel paints flowing ok so I knew what it has to look like more-less. But since it didnt work, I tried adding more and more water each time. I think I ended up with 2:1 water:paint and it still wouldnt flow normally. I also found this paint harder to wash up then the enamel which isnt right according to what I've read. With enamels, a bit of white spirit did the trick. And with acrylics, water wouldnt do much good on the paint that dried up on the sides of the bottle. I had to use special cleaner that came along with airbrush for cleaning acrylics. Last question, what happens with the acrylics as they get older? This paint didnt lay around for too long, not at all actually, at least not since I got it. But it seemed thicker than some of the enamels I got, but that was before thinning...