A Pneumatic Paint Sprayer uses compressed air to atomize paint into a fine mist for smooth, even coatings on metal, wood, and plastics. This project demonstrates atomization, flow control, air treatment (moisture/oil removal), and safe finishing practices. Build it as a manual HVLP gun setup or upgrade to a pressure-pot/automated carriage for continuous spraying.

Parts Used:

1. Air Compressor (1.5–3 HP, 50–100 L tank) – Supplies steady airflow (≈ 150–250 L/min for HVLP).
2. Air Hose & Quick Couplers – 8–10 mm ID hose with leak-free fittings.
3. Air Treatment (FR) – Filter + Regulator with moisture separator; optional coalescing filter + desiccant dryer for ultra-dry air.
4. HVLP Spray Gun (Gravity-Feed) – Nozzles: 1.3–1.4 mm for base/clear, 1.7–2.0 mm for primers; mini regulator at the gun.
5. Paint Cup / Pressure Pot – 400–600 ml gravity cup or 2–10 L pressure pot with fluid/air hose for long runs.
6. Viscosity Cup & Strainers – Ford #4 cup (target 18–25 s); 125–190 µm paint strainers.
7. Test Panel / Turntable – For fan pattern checks and uniform coverage.
8. Spray Booth/Box (Optional) – Exhaust fan with filter mats for fume/overspray control.
9. PPE & Safety – Organic vapor respirator (A2/P2), gloves, goggles, antistatic mat/earth clip, fire-safe storage.
10. (Automation Add-ons, optional) – 5/2 solenoid valve, flow control, Arduino/PLC, stepper linear slide/gantry, limit switches.