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Every painter eventually faces defects, but professional technicians diagnose them systematically. The mistake is blaming the gun before checking the full process. Paint defects come from the relationship between air supply, fluid delivery, material viscosity, panel temperature, booth airflow, reducer speed, and operator movement.
Dry spray usually appears as rough texture, poor gloss, or powdery edges. With LVLP equipment, dry spray often comes from excessive distance, moving too fast, reducer that is too quick, or low fluid delivery. Correct it by returning to the test panel. Set distance at 6 to 8 inches, slow your pass slightly, and confirm the fan is wet through the center. If the surface still looks dry, check whether booth airflow is pulling solvent away too quickly.
Mottling is common with metallic and pearl basecoat. It shows as cloudy areas, dark patches, or uneven metallic orientation. Do not immediately add more paint. First check overlap. Inconsistent overlap creates uneven film build. Next check gun angle. If the gun is tilted, metallic distribution changes across the pass. A controlled orientation coat can help, but only after coverage is even. This is why lvlp spray gun Professional Automotive Tools should be paired with a repeatable application method, not random adjustment.
Runs and sags happen when film build exceeds what the surface can hold. Causes include too much fluid, slow gun speed, excessive overlap, cold panels, or reducer that is too slow. On vertical panels, keep your pass straight and watch recessed areas. Door edges, bumper corners, and quarter panel curves collect material quickly. If a sag starts, do not keep spraying over it. Let the coating cure and repair it properly according to shop procedure.
Solvent pop is more serious. It appears as small pinholes or craters after the surface skins over while trapped solvent escapes. Causes include heavy coats, insufficient flash time, poor booth temperature, or incorrect activator and reducer choice. The correction is process control: thinner coats, correct flash, and proper bake schedule. A general air spray gun can also create these problems if atomization and film build are not managed, but LVLP systems require special attention to slower, deliberate passes.
Pattern imbalance is another frequent issue. If one side is heavy, clean the air cap and fluid nozzle. Never use metal picks that damage precision holes. Use proper cleaning brushes and compatible solvent. A clean gun gives the painter reliable information; a dirty gun creates false problems.
The next article covers spray gun maintenance and calibration.
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