Fine lines

How fine can I do with a Badger Crescendo Model 175, using the fine tip, without masking. I’ve tried varying air pressure, distance and paint viscosity, but the best I do is a 3/16" line. What should be the airbrush settings or definitely do i have to go through masking or another airbrush?

Hello…all depends…do you want a very fine line???. I suggest you masking with Bare Metal foil…