Defects in paint application where the coating drips or runs.

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Defects where the coating flows after application are runs or sags. This happens when the film is laid on too thick or remains too fluid, so gravity pulls it downward as it sets, creating visible drips and sag lines in the finish. It’s different from fisheyes (small holes from contamination), featheredge (edge blending issues), or buffing/polishing (a finishing step, not an application defect). To prevent runs, apply lighter coats in succession, check and adjust viscosity and reducer content, maintain proper spray technique and distance, and allow adequate flash-off time between coats so the film begins to set before another layer is applied.