Spraying any fluid whether it be paint, fence preservative or tanning fluid, requires a little bit of attention prior to approaching the relevant surface. Compressor pressures have to be consistent, the equipment (i.e. gun, jet & needle) have to be immaculately clean and always have something like a sheet of paper to test the flow & spread of the fluid.
Start with the gun flow shut off & then gently open it up until you get the desired spray level. Then take your time. Keep stepping back from the client to examine the coverage and concentrate on the work at hand. Create a masterpiece each time.
The best results on any surface are developed using care & patience and that includes your clients skin. :Grope: