I have a compressor, with water trap. Set for 10psi through the regulator, but it doesnt matter if I attempt it a5 PSI or 40PSI, the paint just bubbles in the cup.
I thin Tamiyas acrylics with Tamiya thinner, it bubble. I thin GW paints with distilled water, it bubbles. I thin Vallejo with Vallejo thinner and it bubbles, all paint is the consitancy of milk or thinner, nothing comes out of the tip, except air.