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A spray gun is a precision coating instrument. In a busy collision repair shop, the difference between a clean gun and a neglected gun often appears as dry spray, poor fan shape, spitting, or uneven clearcoat texture. A proper maintenance SOP protects finish quality and extends the life of the tool.
For lvlp spray gun Professional Automotive Tools, cleaning starts immediately after spraying, not at the end of the day. Empty remaining coating from the cup and wipe the inside with the correct cleaner. Add a small amount of cleaning solvent or waterborne cleaner, depending on the material used, then trigger the gun into a safe waste container. This moves cleaner through the complete fluid passage.
Next, remove the air cap and inspect the holes. Use a soft brush and approved cleaner. Never use drill bits, welding tip cleaners, or hard steel picks, because damaged air cap holes will distort atomization permanently. If clearcoat has cured around the nozzle face, soak only the necessary front components according to the manufacturer’s instructions. Do not soak the entire gun body unless the gun maker allows it.
Remove the fluid needle carefully. Pull it straight back and wipe from rear to front to avoid dragging debris into the packing. Check the needle tip for scratches, rust marks, or dried coating. A rough needle can prevent sealing and cause dripping. Inspect the nozzle seat as well. If the gun has a stainless steel fluid path, corrosion risk is lower, but dried paint still needs to be removed before it becomes a mechanical problem.
For an air spray gun used in professional car coating, air-side cleanliness matters too. Blow clean, dry air through the cap after washing and confirm all passages are open. Check the trigger movement, fluid control knob, fan control, and air valve. Apply a small amount of proper spray gun lubricant to the trigger pin, needle spring area, and adjustment threads. Keep lubricant away from the fluid tip and air cap.
Daily maintenance should include cup gasket inspection, air cap cleaning, nozzle face cleaning, and a spray pattern check. Weekly maintenance should include a deeper inspection of the needle packing, air valve, and regulator connection. Replace worn seals before they leak material into the trigger area.
Storage is part of the SOP. Dry all parts completely and keep the gun in a clean cabinet away from sanding dust and humidity. Do not leave the gun with cleaner inside the cup overnight. Prolonged exposure can swell seals and reduce adjustment accuracy.
A disciplined cleaning routine saves time during refinishing. Instead of fighting pattern defects on the next job, the painter starts with a stable tool. Clean passages, protected seals, and corrosion-resistant components all support smoother basecoat, better clearcoat flow, and fewer rework hours.
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