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Tiny internal air holes inside spray equipment control atomization quality, fan shape, and pressure balance. When they become contaminated with dried coating, sanding dust, or cleaning residue, the gun may produce a distorted pattern, weak side atomization, spitting, or heavy droplets. The worst mistake is to push a sharp hard tool into the passage. Steel picks, drill bits, and hard wire can scratch the air hole, enlarge the passage, and permanently change the spray pattern.
Start by depressurizing the system and disconnecting the air line. Empty the cup, remove the remaining coating, and wipe the exterior so contamination does not fall into the gun during disassembly. Take off the air cap, fluid tip, needle, and any removable baffles according to the manufacturer’s service sequence. Lay the parts on a clean lint-free mat in the order removed. If the job involves frequent solvent cleaning or warm booth operation, LVLP Spray Gun Thermal Resistant, Fluid Compatible components help reduce swelling and premature seal wear.
Soaking should be controlled, not careless. Use only approved cleaner for the coating system and gun material. Place the air cap and fluid tip in a small container long enough to soften residue, but do not soak the entire gun body unless the service manual allows it. Extended soaking can damage seals, packing, and lubrication. After soaking, use a soft nylon brush to loosen coating around the horns, center holes, and side ports.
For the tiny internal passages, use dedicated cleaning needles made for spray equipment, soft plastic probes, or nylon bristles. The tool should remove softened residue, not cut metal. Work from the natural direction of the passage whenever possible and avoid forcing the probe. If resistance is high, return the part to the cleaner rather than increasing pressure by hand. A magnifier or inspection light helps confirm whether the blockage is residue, corrosion, or mechanical damage.
Compressed-air flushing is the next step. Wear eye protection and blow through the passages from multiple angles while holding the part away from your face. Short pulses are safer than one long blast. If the shop has ultrasonic cleaning, use it with the correct solution and time limit. Ultrasonic cleaning is especially useful for air caps with dried clearcoat around small ports, but parts must be rinsed and dried completely afterward.
Before reassembly, inspect the needle tip, nozzle seat, air cap horns, and gasket surfaces. Lubricate only the points specified by the manufacturer. Reassemble the air spray gun carefully, then run a clean solvent test and spray a pattern card. The pattern should be symmetrical, with even edge definition and no random heavy spots. If the defect remains after safe cleaning, replace the damaged component rather than modifying the hole. Precision air passages are designed, not improvised, and protecting their geometry is the key to consistent atomization.
spray equipment maintenance
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