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In professional automotive refinishing, tiny gaps between sprayed coating layers usually start as a material delivery problem, not as a mysterious paint defect. When paint flow is too low, the coating may look misted onto the surface instead of forming a connected wet film. Under inspection light, this can appear as micro holidays, weak hiding, dry texture, or fine separation lines between passes.
The first thing I check is viscosity. If the coating is too thick for the nozzle and pressure combination, the fan pattern will atomize unevenly and the center may be starved. Mix the coating strictly by weight or volume according to the technical data sheet, then confirm flow with a viscosity cup when the shop temperature changes. Cold material often needs more time to stabilize before spraying, especially during morning production or winter repair work.
Nozzle size and needle travel are the next checkpoints. A nozzle that is too small restricts fluid volume and forces the technician to compensate with slower movement or higher pressure. That usually creates more overspray without solving the weak wetting problem. Remove the fluid tip, inspect the seat, and make sure the needle opens fully without sticking. If the job involves solvent-sensitive coatings or warm booth cycles, LVLP Spray Gun Thermal Resistant, Fluid Compatible selection helps keep delivery more predictable during repeated passes.
Air pressure must be balanced with fluid output. Excessive atomizing pressure can break the material into particles so fine that they dry before landing. Low fluid flow plus high air velocity is a common reason the sprayed layer cannot merge into the previous pass. Set the regulator at the gun, not only at the wall, and test the pattern with the trigger fully pulled. A healthy pattern should be even from top to bottom, with no heavy tails and no pale dry center.
Application rhythm matters just as much as equipment setup. Keep spray distance consistent, usually within the range recommended for the coating system, and maintain steady 50-75 percent overlap. If the overlap is too narrow, each pass lands beside the previous one instead of flowing into it. If movement is too fast, the wet film thickness drops below the level needed for hiding power and gloss development.
When I diagnose this issue on a vehicle panel, I spray a test card before touching the repair area. I look for coverage density after one pass, edge wetness, and how quickly the film levels. An air spray gun can produce excellent results, but only when fluid volume, atomization, and operator speed are matched. After correction, apply a controlled medium-wet pass, allow proper flash-off, then inspect with cross lighting. The goal is a continuous film with no dry channels between coating layers.
fixed-point spray stability
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