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In automotive refinishing, a heavy wet coat is not always a better coat. Many coating failures begin when the painter tries to improve coverage, gloss, or flow by applying too much material in one pass. The surface may look smooth at first, but underneath, solvent release becomes restricted and the film cures unevenly.
The first risk is solvent entrapment. When the top layer skins over before the lower layer has released solvent, the trapped solvent expands during bake or later temperature changes. This can cause solvent pop, pinholes, micro-blisters, dieback, or soft film. On high-build primers and clearcoats, excessive application can also increase shrinkage after sanding or polishing.
Film thickness must be controlled from the spray gun setup. Check the technical data sheet for recommended wet coats, flash time, nozzle size, and target dry film thickness. When using LVLP Spray Gun Compact Structure, Flexible Operation, keep the fluid adjustment moderate and avoid compensating for poor hiding by slowing down too much. Instead, use proper overlap, correct reducer speed, and additional controlled coats only when the paint system allows it.
During application, watch the surface behavior after each pass. A correct coat should appear uniformly wet without sagging, flooding panel edges, or forming heavy texture. If the coating remains wet too long, smells strongly of solvent after flash, or strings when touched at the masking edge, the layer is too heavy or the flash time is too short.
Use test cards and wet film gauges when training new painters. Spray a sample panel with the same gun distance, overlap, and travel speed planned for the vehicle. Measure the result and compare it with the coating manufacturer’s specification. This is especially important with high-solids clearcoat, where a small increase in fluid output can create a major increase in film build.
An air spray gun can produce excellent atomization, but it still requires disciplined trigger control. Keep the gun perpendicular to the panel, release the trigger at the end of each pass, and avoid double-wetting edges, body lines, and repair blend zones.
If a thick layer has already been applied, extend flash time according to shop temperature and product guidance. Do not force-cure immediately unless the product allows it. For severe overload, allow full cure, sand flat, and reapply correctly. With LVLP Spray Gun Compact Structure, Flexible Operation, painters can manage transfer efficiency while maintaining controlled, safe film thickness.
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