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The plastic color homogeneity molded parts in the left cavity, because the components of each part of the cooling speed of different, often out of the differences between the bubble and each part of gloss. A product of each part of the plastic parts are assembled together, the differences are often also can appear luster and color. If the shell before and after the TV because the material of different batches and the emergence of differences in color and luster. All parts of this situation paint coating products available, unified color and luster of the products. But also can cover the plastic workpiece in small defects generated in the forming process.

The dark colored plastics some plastic products by the resin color, not made of light colored products, such as phenolic plastic. No waste plastic each again, product color becomes deep, dark. The surface coating can make dark plastic and recycled plastics to improve appearance, make full use of resources.

The smoothness and gloss of plastics products gloss depends on the mold, the mold is very difficult to meet the requirements of different gloss products. By changing the composition of the paint and the extinction agent to adjust the gloss, to meet the needs of the workpiece. In addition, occlusion can be obtained by spraying, coating gloss differences in different parts of the same workpiece, such as film side frame and the side of TV screen frame can be made into different gloss, to give the product a practical and decorative grade higher.

The metal flake aluminum surface finishing of different granularity added in the coating, spraying to coating plastic workpiece can get silver color. If the added amount of transparent pigments, get a different color sense of metal film. In addition, copper powder, pearl powder is added to the coating can get gold and Pearl textured coatings. Like the automobiles wheel cover, motorcycle helmets, all is the sense of metal surface finishing. The other two methods of surface metallization of plastics is vacuum evaporation and magnetron sputtering, can be plating like metal effect. But whether the vacuum aluminum plated or magnetron sputtering, which needed to be molecular deposition of aluminum in a smooth surface over the full can display metal feel, it's only through surface coating can obtain smooth surface, then coating deposited on aluminum molecular can get smooth metal film light. In order to protect the metal film layer is not firm, and also in the above coated with a layer of protective coating, this layer of protective coating if add transparent pigment or dye can be colored metal effect. Such as the addition of yellow dye transparent in the protective paint, can make the aluminized film gold decoration effect. Typical products like automobiles lamp reflector, sanitary ware, plastic coating decorative board and other products.

The new looks like appeared in recent years, imitation leather coating, paint. In addition, through the construction process specific, is available in plastic products into wood finishing effect, marble effect, hammer effect, crystal grain effect, the speckle effect and so on many kinds of artistic effects of coating, increase the commercial value of products, expand the scope of application.

The finishing a variety of patterns by occlusion in a piece of plastic products, and can be in different parts of finishing paint with different colors, such as for plastic toys. Can also be painted on a transparent plastic products on the back, and then scrape need painting parts, then finishing another color paint, looked from the front can be finishing effect of two kinds of colors, such as car dashboard, in a black dial can see green scale. In the plastic products can be obtained by words or patterns by screen printing, pad printing, transfer printing method. Such as beer box, fruit and a pen holder of the pattern and text.

The plastic consistent appearance such as plastic heel of leather shoes of different colours required coating and leather color and gloss consistent coating. Through the shielding effect of coating, plastic heel into multilayer coating.

In short, surface coating of plastic products at first only to produce hide at molding defects, then become no longer just cover up ugly, but to beautify the appearance of an indispensable means of plastic.