I am in the process of trying to respray a car. I am using ss acrylic urethane (restoration shop) with my gun (Iwata lph 400) 1.4 tip and orange cap, The manufacturers recomendation is up to 1 quart per gallon for reducer, At that ratio i was getting a whole bunch of orange peel. The paint was coming out of the gun way to thick. Thinking maybe it was just trying shoot the single stage acrylic urethan with that gun was just not the ticket. I brole out the old devilbiss siphon gun and had the same problem tii i added a bit more reducer. What is the best way to get the viscosity correct when the manufacturers recomend isnt working? I was amazed how much more material the devilbiss uses. It will be nice to get the iwata figured out