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The Automotive Interior Parts offer convenience and riding comfort for passengers. One of its main features is that it is placed in a conspicuous place. Therefore, automotive interior part manufacturer attach importance to appearance quality. Additionally, appearance quality of Interior Parts is more important as the senses of passenger heighten. Most Automotive Interior Parts manufactured by Injection Molding to mass produce it with complex geometry. But there are numerous defects in method of Injection Molding. Especially, large products like automotive interior parts are disadvantage. A typical example of defects is weld line, sink mark, short shot. These are having an adverse effect on the appearance quality as well as another quality like BSR (Buzz Squeak Rattle) and Side impact performance. In order to improve problem, molding has been modified and spray coating has been done over the past.