How to Maintain an Automotive Paint Gun

Detach the air regulator from the paint gun. The air regulator, located at the gun's base, connects compressed air to the gun. Prior to detachment, ensure the compressed air source is disconnected, then proceed to remove the regulator from the gun.

Unscrew the lid of the paint cup to empty any remaining material. Proper disposal is crucial; designate separate containers for different materials:

• Hardened (Catalyzed) Material: for substances that solidify.
• Base coat (Liquid) Material: for liquid substances.

Use paper towels to wipe off any excess material from the cup and lid. Removing excess material beforehand facilitates easier cleaning with the thinner. Note that paint thinner is corrosive and can weaken paper towels when drying.

Add a small amount of waste thinner (enough to fill the gun throat) into the cup. Waste thinner, also known as recycled thinner, has been previously used. The gun throat refers to the bottom inside part of the cup.

Vigorously shake the paint gun to ensure thorough coating of the cup's interior with thinner. This ensures complete dissolution of any remaining paint or base coat by the thinner.

Direct used thinner into a waste thinner container through the fluid nozzle. Simply point the nozzle into the container and squeeze the trigger as you would during normal operation.

Use paper towels to wipe all components until completely dry.

Repeat steps four through seven at least once or until satisfied with the initial cleaning.

Detach the paint cup by turning it counterclockwise until it releases. Also, remove the lid of the paint cup.

Remove the fluid needle to prevent bending or damaging it while removing other components. Start by removing the fluid adjustment knob, typically located in the middle on the rear of the gun. Clean each part with waste thinner as you disassemble them.

Extract the spring revealed after removing other parts by pressing the trigger and pulling the fluid needle straight out. Once again, ensure to clean all parts with waste thinner as you disassemble them.

Take off the air cap from the front of the paint gun by turning it counterclockwise until it detaches. Then, using the paint gun key, locate the appropriate size for the fluid nozzle and unscrew it counterclockwise. As before, clean all parts with waste thinner as you disassemble them.

Once you're satisfied with the secondary cleaning, dry everything thoroughly and then proceed to rinse with clean thinner. Ensure to rinse the gun body, cup lid, air cap, and all parts still containing paint residue, except for any gaskets. Although this process may seem repetitive, it will save you from future troubles and ensure a pristine paint gun.

Use clean paper towels to dry all parts, and if available, utilize compressed air. The compressed air comes in handy for cleaning holes and inaccessible moving parts. Ensure the gun is completely dry after using compressed air, as residual liquids can be forced back onto surfaces due to pressure in crevices and moving parts.

Assemble the gun and its components. Remember to lubricate moving parts and threads as you reassemble. Lubrication prevents sticking or seizing of both removable and non-removable mechanical components.

Wipe off any excess oil from the gun using clean paper towels. Once this is done, the gun is ready for use or storage.

Commence the final cleanup after completing all the previous steps. Ensure all waste materials are properly contained in designated containers away from any sources of heat. Additionally, tidy up all workstations and put away tools. Upon completion of this step, you'll have a clean, contaminant-free paint gun and workstation.