Reply by Earlextech

You can change this slightly to suit your needs but, set the compressor at 45psi, set the gun at 10psi. Anything over 10psi is not considered HVLP. Using a 1.5 mm needle (or equivalent) be sure to spray evenly across the project, pulling the trigger before you are on it and releasing after you are off it.
Also, practice with water in the gun first and spray on cardboard, so you can see the pattern and adjust the fan and flow rate.

-- Sam Hamory - The project is never finished until its "finished"!