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Scattered paint droplets around the main spray pattern are a warning sign that atomization is no longer controlled. In the booth, this defect often appears as a halo of specks outside the normal fan, rough overspray at the panel edge, or random dots landing beyond the wet path. If ignored, the final finish may show texture, dry spray, excessive orange peel, or polishing difficulty after curing.
Start diagnosis with a paper pattern test. Hold the gun at normal spray distance, pull the trigger fully for one second, and examine the fan shape. A healthy pattern should have a clean oval or long vertical form, even distribution, and soft but controlled edges. If droplets scatter outside the main shape, do not immediately raise pressure. More air may break the paint into smaller particles, but it can also create bounce-back and worsen the halo.
The air cap is the first part to inspect. Remove it and check every horn hole and center hole under bright light. Dried clear, primer dust, or polishing compound can block one small passage and disturb the entire fan. For LVLP Spray Gun Surface Polishing level work, I clean the air cap with solvent and a soft brush, never with steel wire that can enlarge the holes. Damaged air cap holes create permanent distortion and should not be repaired by force.
Next, inspect the fluid tip and needle. A worn tip seat allows material to leave unevenly before air can shape it. A bent needle or contaminated needle seat can cause spitting at trigger start and finish. Tighten the nozzle correctly, but do not overtighten. A Tight Connection is required to prevent air leakage around the nozzle, yet excessive torque can damage threads or distort the seat.
Paint viscosity is another common cause. If material is too thick, droplets cannot break down cleanly and will travel outside the fan. If it is too thin, the spray may become unstable and dry before reaching the panel. Mix according to the technical data sheet, confirm reducer temperature range, and strain the material before loading. A controlled air spray gun pattern depends on both correct pressure and correct material flow.
Check inlet pressure with the trigger pulled. Static pressure at the wall does not tell the truth. If the hose is too long, the regulator is restrictive, or the quick coupler is undersized, pressure can drop during spraying. This produces pulsing, coarse droplets, and fan-edge instability. Also check that the cup vent is open. A blocked vent can starve the gun and create intermittent spits.
Spray technique must be verified after mechanical checks. Keep the gun 15–20 cm from the panel, square to the surface, and moving before pulling the trigger. Do not arc the wrist at the end of the pass. For LVLP Spray Gun Surface Polishing jobs, a consistent pass speed is more effective than trying to flood the surface.
After cleaning and adjustment, reassemble the nozzle set and confirm a Tight Connection at the air cap ring, fluid nozzle, cup, and air inlet. Spray another pattern test. If scattered droplets remain, replace the air cap or fluid tip set as a matched assembly. Fixing halo droplets is a step-by-step process: clean, inspect, measure, test, and only then replace parts.
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