A good, functioning spray gun is your most important tool when refinishing autos. If it’s not working the way it should be, you may be in trouble. Here are a few of the most common paint gun issues, along with some tips on how to fix them.
Cause: The most common cause is air leaking around a loose fluid nozzle.
Fix: Tighten the fluid nozzle.
Cause: Your air cap is plugged or worn and must be replaced.
Fix: Remove your air cap, then clean or replace it. (The cap is brass, so you should use only a non-metallic point when cleaning).
Cause: Your Teflon packing is worn.
Fix: Replace the Teflon packing.
Causes: Your inlet pressure is too low or high or the spray material is too thick or thin.
Fix: Adjust the air pressure and/or the product viscosity.
Causes: You are getting too much material flow or the product viscosity is too thin, or you are tilting the gun at an angle.
Fixes: Adjust the gun or reduce the fluid pressure, mix the product properly, apply lighter coats, or hold the gun at the proper angle related to the surface.
Fix: Adjust the distance of your spray, increase the air pressure, or reduce the fluid pressure. Follow the paint manufacturer’s mixing instructions. Properly clean and prepare the surface.
Causes: Your air pressure is too high, the material has not been properly reduced, you are spraying too far from the surface, or you are spraying too fast.
Fixes: Decrease the air pressure, reduce the material to the right consistency, or adjust the distance or speed of your spray.
Following these tips will help keep your spray gun in good working order on your next paint job.