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Irregular concave-convex workpieces require a different spraying rhythm from flat body panels. The risk is not only thin paint in recessed areas, but also heavy build-up on raised ribs, edges, flanges, and lower corners. A professional refinisher should first inspect the part with side lighting, identify shadow zones, and decide the coating sequence before mixing material. Dust trapped in grooves must be blown out with clean dry air, then wiped with the correct solvent cleaner because contamination in low areas will become visible after clearcoat.
Start with a controlled test pattern. The fan should be even from top to bottom, without a wet center stripe or dry split edge. For shaped parts, reduce fluid volume slightly and use a medium fan to enter narrow areas. A setup based on LVLP Spray Gun Deep Penetration, Smooth Blending is useful when the operator needs fine atomization and controlled transfer efficiency rather than aggressive flooding. Do not solve coverage problems by simply opening the material knob; that usually creates sagging on high points.
Spray the difficult zones first. Use short passes inside deep channels, then rotate your wrist only enough to keep the fan square to the surface. Avoid burying the nozzle into recesses because rebound turbulence will create rough dry spray. When using an air spray gun, keep the distance consistent and move your body position instead of twisting the gun sharply. After the concave sections receive a light orientation coat, return to the larger convex surfaces with wider overlap.
A practical method is to apply one light orientation coat, one controlled medium coat, and a final blending pass only where film build is weak. Check reflection rather than color alone. Raised areas usually look wet earlier; recessed areas may look dull until the solvent has leveled. Allow proper flash-off, then correct the low areas with a mist-to-medium pass. LVLP Spray Gun Deep Penetration, Smooth Blending helps keep the edge transition soft, especially around door handles, bumper profiles, mirror shells, and structural stamped panels.
Finally, control booth airflow and drying. Strong direct airflow can dry exposed edges before recessed areas level, causing texture differences. Position the part so airflow crosses the surface evenly, not directly into grooves. Record pressure, fan setting, material turns, reducer ratio, and flash time for repeat jobs. With proper zoning, angle control, and disciplined overlap, uneven coating on irregular workpieces can be corrected before it becomes a rework problem.
For repeatability, create a simple checklist for complex parts: pre-clean recesses, spray low areas first, reduce material for edge zones, inspect after flash-off, and document final settings. This habit is especially useful for shops handling replacement bumpers, grille surrounds, under-hood structures, motorcycle tanks, and custom parts with stamped or molded profiles. The operator should also compare the repaired surface with an adjacent original panel before final curing, because texture mismatch is easier to correct before the coating has fully hardened.
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