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Ripple marks on a finished sprayed surface are usually caused by uneven material flow before the coating has stabilized. In automotive refinishing, this defect may appear as wave-like texture, flowing bands, or directional distortion under booth lighting. It is different from normal orange peel because ripple marks often follow the painter’s pass direction or panel contour. To eliminate them, a technician must check both the coating condition and the spraying process.
Start with substrate preparation. Sanding scratches, solvent swelling, featheredge mapping, and poorly cured primer can all print through the final finish. Before spraying, confirm that primer surfacer is fully cured, block-sanded evenly, and cleaned with the correct wipe method. Use one wet cloth and one dry cloth, and do not flood the panel with solvent. Trapped cleaner can soften under basecoat or clearcoat and create movement that looks like ripple.
Then check coating viscosity and reducer speed. If the material is too thick, it may not level. If the reducer is too slow or the booth temperature is too low, the film may remain open too long and move after application. If the reducer is too fast, the surface may skin before the lower layer flows out. Mix according to temperature, humidity, panel size, and airflow conditions.
Gun setup is the next checkpoint. A LVLP Spray Gun Modular‑Designed, Tool‑Less Disassembly design allows fast inspection of the nozzle, needle, and air cap, which is important because partial blockage can create uneven fluid delivery. Spray a test pattern on masking paper. If one side of the fan is heavier, clean the air cap horn holes and check the nozzle seat. A distorted fan will create uneven film build, and uneven film build often becomes ripple after flash-off.
Control your movement. Keep the gun perpendicular to the workpiece and maintain a consistent distance. Do not slow down at the center of the panel or over-apply at curved sections. When spraying clearcoat, apply the first coat medium-wet to establish grip, then apply the second coat with controlled wetness. Trying to achieve full gloss in one overloaded pass often causes wave texture, sagging, and ripple.
Air pressure must remain stable during the pass. A worn regulator, undersized hose, water separator restriction, or weak compressor can cause pressure drop. Even a quality air spray gun cannot maintain surface uniformity if atomization changes during each stroke. Always check dynamic pressure with the trigger pulled.
If ripple marks already exist, allow proper curing before correction. Do not sand too early. Once cured, level the surface with suitable grit, refine the scratches, and polish progressively. For severe ripple under clearcoat, re-sanding and re-clearing may be necessary. With a clean LVLP Spray Gun Modular‑Designed, Tool‑Less Disassembly system, correct viscosity, and stable technique, ripple defects can be prevented before they reach final inspection.
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