Painting

Liquid Painting (Wet Painting) offers the ultimate versatility in surface finishing. Unlike powder coating, which requires heat and conductivity, liquid paint can be applied to virtually any substrate, including Plastics (ABS, PC, Nylon) and composites, as well as metals. It allows for thinner coatings, finer surface textures, and precise color matching to Pantone or RAL standards.

At Jucheng Precision, our painting facility features dust-free clean rooms to ensure a flawless Class A surface finish. We specialize in functional coatings such as EMI/RFI Shielding (conductive copper/nickel paint) for electronics and premium Soft-Touch rubberized coatings for consumer handheld devices. We adhere to ASTM D3359 standards for cross-cut adhesion testing to guarantee durability.

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Wet Painting

Key Specifications

Specification Technical Range Note
Max Part Size 2000 mm x 1200 mm x 800 mm Spray booth dependent
Coating Thickness 15 – 40 µm (0.0006″ – 0.0015″) Thinner than powder coating
Color System Pantone (PMS), RAL, Custom Sample Exact color matching possible
Compatible Materials All Metals & All Plastics Ideal for heat-sensitive plastics
Gloss Levels Flat Matte to High Gloss (Wet Look) Measured in Gloss Units (GU)
Adhesion Test ASTM D3359 (Cross-Hatch) Ensures paint won’t peel
Standard Lead Time 3 – 5 Days Multi-coat layers take time to cure

Paint Types & Functional Coatings

Type Description Key Benefits & Applications
Polyurethane (PU) Paint Two-component (2K) paint known for its extreme durability, UV resistance, and chemical resistance. Benefit: Automotive-quality finish, resistant to weathering.
App: Exterior automotive parts, rugged industrial housings.
Soft-Touch Coating A specialized polyurethane topcoat that gives hard plastic a velvety, rubber-like feel. Benefit: Premium tactile experience, non-slip grip.
App: Remote controls, headphone bands, computer mice.
EMI/RFI Shielding Conductive paint containing Copper, Nickel, or Silver particles sprayed on the inside of plastic housings. Benefit: Blocks electromagnetic interference without metal plating.
App: Medical devices, routers, aerospace avionics covers.
Texture / Spatter Paint Applied to create a stippled or rough surface to hide injection molding defects or machining marks. Benefit: Hides surface imperfections, durable rugged look.
App: Medical cart panels, old-school camera bodies.

Design Guidelines for Painting

Surface Preparation:
Paint amplifies surface defects. Parts must be sanded smooth (400-600 grit) and primed before painting. Tip: If you need a high-gloss finish, the underlying surface must be polished to near-mirror quality first.

Masking:
Paint adds thickness and can clog threads or affect snap-fits. We use precision die-cut tape to mask areas that must remain paint-free. Tip: Clearly mark “No Paint” zones on your PDF drawings.

Internal Corners:
Unlike plating, spraying into deep, narrow boxes is difficult due to air turbulence (blowback). Tip: Ensure deep pockets have ample draft angles or wide openings for the spray gun to access.

Plastic Compatibility:
Some solvents in paint can attack plastics (like polycarbonate), causing stress cracking. We use specific formulations compatible with the substrate material. Always specify the exact plastic grade.

Industry Applications

Consumer Electronics
Soft-touch painting on ABS/PC headphones and wearables creates a high-end “skin-like” feel that consumers love.

Medical Devices
Plastic housings for MRI machines or handheld scanners are painted with chemical-resistant PU paint to withstand daily cleaning with harsh hospital disinfectants.

Telecommunications
Plastic router and modem cases are sprayed internally with conductive Nickel paint to pass FCC electromagnetic interference (EMI) tests.

Automotive Prototypes
Rapid prototypes of door handles or dashboard panels are painted and clear-coated to visually simulate the final production part for design validation.