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Fine metal powder coatings and metallic automotive basecoats are sensitive materials. They do not behave like ordinary solid-color coatings because aluminum flakes, pearl particles, or fine metallic powder must be delivered evenly and oriented correctly on the panel surface. If the nozzle specification is too large, the coating may flood the substrate and cause striping. If the nozzle is too small, metallic particles may clog, shear, or deposit unevenly.
Start by checking the coating technical data sheet. The recommended nozzle size is not a casual suggestion; it is based on viscosity, resin system, particle load, and required atomization energy. For fine metallic basecoat, many technicians prefer a nozzle that supports controlled fluid output with stable fan width. A LVLP Spray Gun Modular‑Designed, Tool‑Less Disassembly platform helps because painters can change or inspect nozzle components quickly without disturbing the entire setup.
Before spraying, filter the mixed coating through the recommended mesh. Metallic materials should not be over-filtered with an excessively fine strainer, because that may remove useful particles and alter color appearance. Stir the cup gently and frequently. Do not shake aggressively after reduction, as trapped air can create micro-bubbles and unstable atomization. Set the gun with moderate fluid flow, balanced fan width, and correct inlet pressure. Even a well-built air spray gun will produce cloudy metallic layout if pressure is mismatched with nozzle size.
During test spraying, observe three points: edge wetness, center density, and metallic orientation. A nozzle that is too open often creates heavy center loading and dark patches. A nozzle that is too restricted may leave dry edges and rough sparkle. Spray one control card, allow flash-off, and compare color travel at different viewing angles. If the repair area shows mottling, reduce fluid slightly before increasing pressure. Too much pressure can over-atomize the coating and make fine metal particles stand irregularly.
Exclusive nozzle specification also improves repeatability. In a production body shop, dedicating one nozzle set to metallic basecoat prevents contamination from primer residue, clearcoat resin, or coarse pigments. Clean the air cap holes after every metallic job because fine particles can dry around horn passages and narrow the fan. A LVLP Spray Gun Modular‑Designed, Tool‑Less Disassembly system is valuable for this maintenance rhythm, especially when painters switch between basecoat blending, bumper refinishing, and spot repair.
The final rule is simple: metallic quality depends on controlled delivery. When nozzle specification, pressure, distance, and overlap are matched, fine metal powder coatings lay down evenly, color matching becomes easier, and rework caused by streaking or patchiness is greatly reduced.
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