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An unbalanced left-right spray fan pattern is a common shop-floor problem, and it must be corrected before spraying the vehicle. If one side of the fan is heavy and the other side is weak, the coating will build unevenly. On a clearcoat job, this may show as striping, orange peel variation, or dry edges. On basecoat, it can cause color inconsistency or metallic mottling. The fastest solution is not to compensate with hand movement; the correct method is to diagnose the gun.
Start with a test spray on masking paper. Hold the gun straight, spray a short burst, and observe the fan shape. A healthy pattern should be symmetrical, with even material distribution. If the left side is heavy, the right horn hole of the air cap may be blocked, or the fluid tip may have contamination. If the right side is heavy, check the opposite side. Many painters forget that air cap blockage often affects the opposite side of the pattern.
Remove the air cap and inspect the horn holes. Use proper cleaning brushes or soft tools. Do not use steel wire, drill bits, or hard needles that can damage precision holes. Even a small scratch in the air cap can permanently affect atomization. Clean the fluid tip, needle seat, and cap face. Dried primer, water-based residue, or clearcoat skin can distort the fan quickly. When using LVLP Spray Gun Angle Adjustable, Gap Covering in tight repair zones, always clean the cap after spraying high-solid materials because edge work often creates more rebound contamination.
Next, check whether the fluid nozzle is tightened correctly. A loose nozzle can pull air unevenly and create a distorted fan. Also inspect the needle for bending or dried coating near the tip. If the needle does not seat centrally, the pattern may lean to one side. Reassemble the gun carefully and avoid overtightening parts.
Air supply must also be checked. A damaged hose, unstable regulator, or water in the line can affect atomization. Set pressure with the trigger fully pulled, not at static pressure. For any air spray gun, dynamic pressure is the real working pressure. If the pressure drops during spraying, the fan may collapse or become uneven.
Material viscosity can make the issue worse. If primer is too thick for the nozzle, the fan may appear heavy in the center or weak at the edges. Strain the material and confirm reducer ratio. Spray another test pattern after every adjustment. Do not spray the vehicle until the paper test is clean.
For emergency on-site correction, follow this order: test pattern, clean air cap, clean fluid tip, check nozzle tightness, check needle movement, verify air pressure, confirm viscosity. LVLP Spray Gun Angle Adjustable, Gap Covering should still produce a balanced pattern when properly cleaned and supplied with stable air. If the pattern remains uneven after cleaning and inspection, replace the air cap or nozzle set rather than risking a full repaint.
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