After use, the spray gun and its accessories should be cleaned immediately. Inattention to maintenance and cleaning is the main cause of gun failure.
When cleaning the suction-feed spray gun, first remove the paint tube and flow the suction tube into the cup. Then loosen the air cap 2-3 turns, cover the air cap with a folded rag, and pull the trigger. This allows the paint from the gun to flow back into the paint tank.
Note: The air pressure used should be low. Do not do the above operation when the paint can is still mounted on the wall, otherwise the paint will splash out of the can.
Re-tighten the air cap and pour the paint can back into the original large can. Clean the inside and lid of the cup with solvent and a thin bristle brush) Wipe off residue with a rag soaked in solvent. Then pour a little clean detergent into the cup, pull the trigger, spray the detergent out, and clean the feeding tube.
Then remove the air cap, soak in thinner or solvent, and use a soft brush like a round-tipped toothbrush or straw broom to clean the clogged holes. Remember, you should never use something like wire or nails to clean these small holes, as these holes are precision drilled. Clean the nozzle with a gun brush and solvent. Wipe the exterior of the wall clean with a rag soaked in thinner, taking care to remove all traces of paint.
At present, in some areas and units, automatic spray gun cleaning machines have been used, combined with manual hand washing to clean spray guns, and the cleaning effect is very good. Put the spraying equipment into the large barrel of the spray gun cleaning and recycling machine, cover the barrel, and then turn on the air pump to rotate the cleaning liquid in the cleaning barrel. It takes less than a minute to clean the parts for use.
Compared to traditional manual cleaning methods, the automatic cleaning solution saves 10 minutes of paint changing operations, and the cleaner increases the safety of the painter because the skin is no longer exposed to those drying solvents. The system is designed with a screw plug at the bottom for easy draining of waste fluids.
In operations such as cleaning the spray gun, a large amount of solvent will remain, and it will be wasteful and not conducive to environmental protection if it is dumped directly. The solvent recovery machine uses high-temperature distillation to recover and process the dirty solvent, and then a clean solvent can be obtained, which saves a lot of solvent and protects the environment.
NOTE: If the spray gun is not cleaned immediately after use, the nozzle may become partially or completely blocked, causing the spray from the spray gun to split (spray dry paint fragments) or the spray pattern will be incorrect. This is especially true for enamels with additives. Because the enamel will harden on the inside of the gun if it is not cleaned immediately after use.
It is best to lubricate the spray gun after working every day, and use a light machine to lubricate all parts. Due to normal wear and aging, seals, springs, needle valves and nozzles must be replaced regularly. Replacement should be carried out according to the manufacturer's instructions. Because excess oil will flow into the paint and oil passages, causing spray defects, great care must be taken during lubrication, and the mixing of oil and paint will reduce the quality of the spray.
Do not soak the entire gun in the cleaning solution for a long time, as this will harden the seal and destroy the lubrication effect.
For best repair results, use different spray guns for different coatings and situations. It is recommended that each person be equipped with four spray guns, one for primer and middle coat spraying, one for topcoat and clear coat spraying, one for silver powder paint spraying, and a small repair spray gun for spot repair. use. If these guns are kept in good cleaning and working order, it will save a lot of adjustment and cleaning time when changing guns.