Spray painting - Matt paint

Spray painting is a process in which specially formulated liquid coatings are atomized through a spray gun nozzle and evenly applied to a workpiece surface. After curing, the coating forms a functional or decorative layer that provides properties such as scratch resistance, wear resistance, and fingerprint resistance. Spray painting is widely used on non-metallic materials, including plastics, wood, composite materials, and carbon fiber, as well as metal substrates.

Common spray coatings include UV-curable coatings, soft-touch coatings (rubberized paint), polyurethane (PU) coatings, metallic coatings, and clear coats.
UV-curable, soft-touch, and metallic coatings are among the most commonly used types. Many consumer electronics products, including watches, smartphones, and headphones, undergo UV coating. Soft-touch coatings are widely used on handheld devices, such as power tools and massage guns, to provide a smooth, comfortable feel. Metallic coatings are often applied to plastic parts to create a metallic appearance and finish.

• Typical coating thickness: Topcoat, 10–35 μm; primer, 5–15 μm. Sharp corners and recessed grooves are prone to paint buildup and sagging.
• Edges and sharp corners: Coatings tend to be thinner along edges and sharp corners, increasing the risk of adhesion failure.
• Deep grooves and blind holes: These features may trap excess paint or air bubbles. Consider adding draft angles or openings where feasible.
• Substrate temperature resistance: Confirm that plastic substrates can withstand the curing temperature, as high-temperature baking may cause deformation.
• Surface finish requirements: Matte coatings tend to reveal substrate imperfections, while glossy coatings are highly sensitive to dust, orange peel, and scratches.