Metallic basecoats present unique challenges in automotive refinishing due to aluminum flake sedimentation. This guide provides 10 professional solutions to prevent nozzle clogging and maintain stable spray performance.
Why Automotive Pneumatic Spray Guns Clog Easily When Spraying Metallic Paint: 10 Practical Solutions from a Refinishing Expert
Metallic basecoats contain aluminum flakes that tend to settle quickly, leading to sediment accumulation and nozzle blockage if not properly managed.
1. Metallic Pigment Sedimentation
Agitate paint thoroughly and stir every few minutes during spraying to maintain refinished painting lvlp spray gun fine atomization stability.
2. Incorrect Fluid Tip Size
Use 1.2–1.3 mm nozzle for metallic basecoat applications.
3. Improper Paint Straining
Always strain paint using 125-micron filter before filling the cup.
4. Low Air Pressure
Verify dynamic pressure under trigger pull for stable air spray gun atomization.
5. Excessive Spray Distance
Maintain consistent 15–18 cm distance from panel.
6. Long Spray Pauses
Re-stir paint if pause exceeds 3 minutes.
7. Inadequate Cleaning Between Coats
Wipe nozzle with solvent-damp cloth between coats.
8. High Booth Temperature
Control booth temperature and use proper reducer speed.
9. Worn Fluid Components
Inspect and replace worn needle or nozzle components.
10. Incorrect Mixing Ratio
Follow TDS precisely and measure viscosity before spraying.
Proper fluid management and equipment setup prevent metallic clogging and ensure uniform finish quality.
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