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A spray gun does not fail all at once. It usually loses performance slowly through dried clearcoat, blocked air cap holes, worn needles, swollen seals, dirty cup vents, and careless storage. By the time the painter sees spitting or a distorted fan, the job may already be at risk. In a professional refinish shop, I treat gun care as part of the painting process, not a separate cleanup chore. A reliable lvlp spray gun Professional Automotive Tools routine protects atomization, transfer efficiency, and finish consistency.
1. Flush immediately after spraying
Do not let basecoat or clearcoat sit in the fluid passage while you prepare the next job. Empty the cup, wipe the cup throat, add the correct cleaning solvent, and flush until the discharge is clean. Pull the trigger in short cycles to move solvent through the needle passage. Keep the gun pointed into an approved cleaning container. A neglected air spray gun can contaminate the next coating with small chips of dried material that are almost impossible to hide in clearcoat.
2. Clean the nozzle and air cap correctly
Remove the air cap and fluid nozzle according to the manufacturer’s sequence. Use soft brushes and proper cleaning picks only. Never drive steel wire through precision air holes, because one enlarged or scratched opening can change the fan shape permanently. Inspect the horn holes under light. If one side is partially blocked, the pattern may lean, split, or leave a dry edge. Clean threads gently and avoid soaking seals unless the manufacturer says they are solvent-safe.
3. Inspect wear points
Check the needle tip for grooves, bends, or dried coating. Look at the nozzle seat for scoring. Inspect packings, gaskets, cup seals, and the vent hole. A blocked cup vent can create pulsing because material cannot feed smoothly. A worn needle packing may allow leakage or inconsistent trigger feel. The trigger should move smoothly without sticking. If lubrication is recommended, use only the approved gun lubricant and keep it away from the fluid path.
4. Reassemble and calibrate
After cleaning, reassemble the gun without overtightening the nozzle. Connect air and confirm that the fan, fluid, and air controls return to baseline positions. Make a short test pattern on masking paper with clean solvent or approved test material. The pattern should be even and symmetrical. If it is not, correct the issue before the next repair. Daily calibration includes confirming handle pressure with the trigger open, checking fan response, and recording any change in feel or pattern size.
5. Store for the next job
Store the gun dry, clean, and protected from booth dust. Do not leave solvent trapped in the cap or cup for long periods unless the equipment maker allows it. Keep dedicated guns separated by coating use when possible: primer, basecoat, and clearcoat tools should not be casually mixed. Label settings, tip sizes, and common materials so another technician can pick up the tool and reproduce the same result.
This final routine closes the workflow. From setup to fluid tip choice, pressure mapping, overlap discipline, clearcoat control, and maintenance, professional finish quality comes from repeatable steps rather than luck. A clean and calibrated gun gives the painter confidence before the first pass starts.
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