1, plastic molding is easy to form internal stress, after painting the stress concentration is easy to crack. Annealing or surface treatment can be used to eliminate stress.
2, the surface of the plastic parts are often stained with oil, hand sweat and mold release agent, it will make the coating adhesion deterioration, coating cracking, blistering and peeling. Degreasing treatment should be carried out before coating.
3, in addition to electricity and dust: plastic products are insulators, surface resistance is generally around 1013Ω, easy to generate static electricity. After charged, it is easy to adsorb fine dust in the air and attach to the surface.
4, plastic coating thickness of 15 ~ 20μm, usually to spray 2 ~ 3 to complete. A spraying after drying 15min, and then the second spraying. Need a bright surface must also be sprayed transparent coating, coated parts for flame retardant properties basically have no effect.
5. After coating, it can be self-drying at room temperature or baked at 60℃ for 30min.