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Curved components are difficult to refinish because the local surface angle changes continuously. A spray gun that remains fixed in space may be perpendicular to one section and severely angled to the next. This produces uneven droplet impact, dry shadow zones, heavy edge loading, metallic distortion, and inconsistent clearcoat flow.
Divide the Part Into Spray Zones
Before mixing material, study the component and divide it into logical zones: the main face, return edges, recesses, crowns, undercuts, mounting tabs, and backside transitions. Plan the order so overspray from one zone can be absorbed by the next wet pass. For mirror housings and bumper inserts, spray difficult recesses first, then finish the broad visible surface.
With a lvlp spray gun, use a stable medium fan for small parts instead of closing the fan completely. An overly narrow pattern concentrates fluid and makes curved sections easier to overload.
Keep the Fan Perpendicular to the Local Surface
The air cap should face each section as squarely as access allows. Move the shoulder, elbow, wrist, and feet together rather than rotating only the wrist. The goal is not to hold one permanent gun angle; it is to adjust continuously so the fan remains approximately perpendicular to the changing contour.
Practice the movement with air only. Trace the part while maintaining a consistent distance between the air cap and the local surface. Use a clean reference stick during training to confirm that the distance does not collapse around crowns or increase across recessed areas.
Control Edge and Return-Surface Loading
Sharp edges receive coating from more than one direction and can build film rapidly. Apply a light orientation pass to edges and return surfaces before spraying the main face. Feather the trigger as the fan enters and exits a narrow section. Avoid holding a fully triggered fan on a corner while repositioning.
For an air spray gun, set dynamic pressure and confirm the pattern before reducing fan width. If the pattern becomes center-heavy, reduce fluid delivery slightly rather than increasing pressure beyond the approved range.
Use Short, Overlapping Passes
Long straight strokes are rarely suitable for complex parts. Use shorter passes that follow the geometry, maintaining consistent overlap between zones. On convex surfaces, the center of the fan contacts first; on concave surfaces, the outer portion may strike first. Watch the wet band and adjust angle so both sides of the fan deposit evenly.
For metallic basecoat, keep the final orientation pass controlled and consistent. Excessive gun angle can push metallic particles toward one side, creating dark bands or mottling. For clearcoat, preserve a continuous wet edge without flooding low points.
Fixture the Part Correctly
Mount the component at a height and angle that allows access without touching or rotating it during a wet coat. A fixture should expose visible edges and backside returns while remaining stable under booth airflow. Rotate the fixture only between defined spray stages, not during an active pass.
Verify Coverage and Film Build
Use contrasting test cards or inspection lighting to identify dry shadows. Check crowns, lower returns, bolt pockets, and recessed corners after each coat. Record fan setting, distance, pressure, fluid position, pass order, and fixture angle for repeat jobs.
internal airflow design and air-cap geometry determine how well a spray gun maintains droplet uniformity when the fan is used across rapidly changing contours.
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