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Uneven gloss is often blamed on clearcoat viscosity, booth temperature, or reducer selection, but inconsistent gun distance is frequently the real cause. When the gun moves too close to the panel, coating density rises, droplets stay wetter, and local film build increases. When the gun moves too far away, droplets begin drying before impact, producing dry spray, reduced leveling, and a dull appearance.
Establish a Fixed Working Distance
Start with the coating and spray-gun manufacturer’s recommended range. For many automotive basecoat and clearcoat systems, the practical distance is approximately 150–200 mm, although the exact value depends on air-cap design, nozzle size, viscosity, and fan width. Cut a rigid reference strip to the selected distance and use it during practice. Position it between the air cap and a training panel before each pass.
When using a lvlp spray gun, distance control is especially important because the lower air volume leaves less room to compensate for an unstable pattern with pressure.
Practice Parallel Movement
The air cap must remain parallel to the panel from the start of the pass to the finish. Wrist arcing brings the gun closer at the center and farther away at both ends, creating a wet center, dry edges, and visible gloss variation after curing.
Practice with the trigger released first. Move the shoulder and forearm while keeping the wrist stable. Once the path is consistent, add air-only triggering, then apply material on masking paper or a reusable panel.
Use a Grid-Based Exercise
Mark horizontal and vertical lines at 100 mm intervals. Spray one pass across each horizontal line while holding the selected distance. Use approximately 70–75% overlap, or the percentage required by the coating system. Inspect the wet band under angled booth lighting. Dull sections indicate excessive distance, insufficient overlap, or excessive travel speed. Heavy glossy sections indicate reduced distance, slow movement, or excessive fluid delivery.
For an air spray gun, check dynamic pressure with the trigger fully pulled before every exercise. Pressure fluctuation can change droplet size and make correct distance appear ineffective.
Train Around Curves
Repeat the exercise on a hood edge, door crown, wheel arch, or curved test piece. The gun must follow the contour while remaining perpendicular to the local surface. Reposition the feet and shoulder instead of rotating only the wrist. On large panels, divide the area into manageable zones and use the same body reference for every pass.
Verify the Result
Use wet-film gauges during process development and inspect cured gloss under the same lighting angle. Record working distance, dynamic pressure, fan width, fluid-control position, overlap, travel speed, booth temperature, and flash time. Repeat the exercise until the technician can maintain distance without the reference strip.
external paint buildup around the air cap should also be checked before training, because contamination can distort airflow even when distance and movement are correct.
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