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A balanced fan pattern is one of the fastest ways to identify whether a spray gun is ready for vehicle coating. Many coating defects begin before the painter reaches the panel: a dirty air cap, damaged nozzle, incorrect fluid setting, or uneven horn pressure can create a pattern that is heavy on one side and weak on the other. Professional calibration prevents these faults from becoming visible in the finish.
Begin by cleaning the air cap, nozzle, and needle seat. Even a small amount of dried clearcoat on one horn hole can push the pattern sideways. Use proper cleaning brushes and approved solvent; never force metal wire through precision air passages. Reassemble the gun carefully and confirm that the needle moves smoothly when the trigger is pulled. For technicians using lvlp spray gun Professional Automotive Tools, this inspection should be part of the first setup before every refinishing job.
Hang a clean test card or masking paper at booth height. Fill the cup with properly mixed and strained material, then hold the gun square to the card at the same distance you will use on the vehicle. Pull the trigger for one quick burst. A correct fan should have an even oval shape, balanced wetness, and similar edge density from top to bottom. A banana-shaped pattern usually means air cap contamination or damage. A split pattern often means too much air pressure or not enough fluid.
Adjust the fan control gradually. Open the fan until it matches the size of the panel area, then set fluid output so the material lands wet without flooding. If you reduce the fan too much, film build becomes concentrated and the painter may create stripes. If the fan is too wide for the panel, the outer edges can dry before they level. With an air spray gun, the goal is not the widest possible pattern; the goal is a pattern the painter can repeat with steady overlap.
On doors, hoods, and quarter panels, use the calibrated pattern to plan your pass sequence. Begin each pass slightly before the panel edge and release the trigger just after the opposite edge. Keep wrist movement locked and move with your shoulder and body. For large horizontal panels, walk the length instead of reaching across the surface. Reaching changes distance and angle, causing dry bands and uneven clearcoat texture.
After the first coat, inspect coverage under booth lighting. If the top edge of each pass appears heavier, rotate the cap or retest the pattern before continuing. Do not compensate for a bad pattern by changing your wrist angle; that only moves the defect. The next skill is overlap and gun distance, because even a perfectly calibrated pattern will fail if the painter cannot maintain spacing and rhythm on the panel.
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