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Paint treatment

Table of Contents

Definition

Painting, or liquid spray painting, is a traditional surface finishing technology that coats liquid pigmented paint evenly onto workpiece surfaces. After air-drying or baking curing, a continuous protective and decorative film is formed. It can be applied to metals, composite materials, plastics and wood substrates.

Main Types of Paint Systems

1 Air-dry Paint

No high-temperature baking required; cures naturally under room temperature. Suitable for large, heat-sensitive parts or on-site refurbishment.

2 Baking Paint

Needs heating in an oven at 60–140°C to complete cross-linking. Features stronger adhesion, harder film, superior wear and chemical resistance. Widely used for mass-produced metal and plastic products.

3 Primer + Topcoat Two-coat System

  • Primer: Covers surface flaws, improves bonding force between substrate and topcoat, provides basic anti-corrosion performance.
  • Topcoat: Offers rich colors, gloss and weather resistance as the visible decorative layer.

4 Clear Varnish

Transparent protective coating without pigment, used to retain original texture of polished metal or printed patterns while resisting scratches and oxidation.

Standard Process Flow

Pre-treatment (degreasing / sandblasting / general grinding) → Surface cleaning → Primer spraying → Flash-off → Topcoat spraying → Curing / Air drying → Finished painted parts

Core Advantages

  1. Extremely rich color choices, customizable gloss levels: high-gloss, semi-gloss, matte, frosted and metallic textures.
  2. Thin and uniform coating layer, lightweight without obvious dimensional change to precision components.
  3. Excellent covering power to hide substrate defects such as machining marks and small pits.
  4. Applicable to diverse materials including heat-labile plastics which cannot bear powder coating’s high curing temperature.

Disadvantages

  1. Contains volatile organic solvents (VOCs), requiring professional exhaust and environmental protection equipment.
  2. Lower material utilization rate compared with powder coating; over-sprayed liquid paint cannot be fully recycled.
  3. Thinner film thickness leads to weaker scratch and anti-corrosion performance than powder coating.
  4. Outdoor paint will fade and chalk under long-term UV exposure without high-grade weather-resistant paint.

Applicable Materials

Aluminum alloy, steel, stainless steel, zinc die castings, ABS, PC, carbon fiber composites, wood products.

Surface treatment resources

Frequently Asked Questions

  To shorten the delivery cycle of CNC workpieces, we start with the documents submitted by customers. Please provide complete and clear 2D drawings, 3D models, dimensional tolerances, surface requirements, and processing specifications, and specify special materials, surface treatments, and assembly standards. Avoid incomplete drawings, ambiguous markings, and version confusion.
Complete documents enable direct programming, order splitting, and production scheduling, cutting down repeated confirmation and supplementary work. Customers are also advised to finalize order quantity, delivery schedule, and special requirements in advance. Eliminating repeated communication and rework risks at the source accelerates the whole process and effectively shortens the overall lead time.

  With 12 years of expertise in CNC machining, YUEYI stands out from other manufacturers and middlemen. Our factory covers an area of 4,000 mu and is equipped with over 100 processing machines. We achieve a machining precision up to 0.001 mm, capable of producing high-precision components. Backed by standardized production management, our on-time delivery rate reaches 98%. As a direct manufacturer with full in-house production capacity, we control every production link without outsourcing. We deliver consistent quality, outstanding precision and reliable lead time, making us your trustworthy partner for CNC precision machining.

  Fast delivery is one of our key strengths. For 3D printing orders, we support delivery within 3 days, ideal for rapid prototyping and urgent sample requests. For regular CNC machining projects, the standard lead time is around 3 weeks.
We manage the whole process in-house, from drawing review and process planning to production, quality inspection, and shipment, with no intermediate links. Equipped with complete facilities and an experienced team, we reliably fulfill both urgent sample orders and mass production. We guarantee stable lead time and consistent quality to keep your projects on track.

  We offer a full range of surface treatments with rich color options. Our services include anodizing, powder coating, spray painting, electroplating, wire drawing, sandblasting, and polishing. Anodizing features various colors and strong anti-corrosion performance for aluminum parts. Powder coating and spray painting come with extensive color selections and durable coatings. Electroplating enhances luster and rust resistance. Wire drawing creates fine linear textures, while sandblasting delivers a matte finish. Polishing achieves a bright and smooth surface. All finishes can be customized in colors and styles to match your application needs.

  Yes, we fully provide complete material certificates and relevant test reports for all CNC-machined parts. All raw materials are sourced from qualified suppliers with authentic documentation. We can offer material certifications, dimension inspection reports, and quality test records upon request. Every product is strictly inspected before delivery. These official documents fully guarantee material compliance and product quality, supporting your quality audit and project requirements.

  We take strict quality control measures in advance to prevent non-conforming products. Every workpiece is fully inspected dimensionally and visually during and after production to ensure full compliance with design drawings and specifications.
In the rare case of non-compliant items, we will take immediate responsibility. We will promptly confirm the issues with you, then arrange free rework or remanufacturing as required. All related costs will be borne by us. We will also analyze the root cause to optimize our processes and avoid similar problems recurring. Our goal is to deliver qualified products steadily and safeguard your project progress.

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