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Underbody coating is used to prevent chipping damage of the automobile underbody and wheel well. Multi-functional material that gives sound insulating properties is called sound insulating underbody coating. This paper describes the development of underbody coating material with powdered acrylic composition as an alternative to polyvinyl chloride resin. The new material also has better foaming properties. It is possible to ensure excellent sound insulating performance with thin film. This multi-functional underbody coating is the first application in the world with weight reduction and cost saving, and in a more environmentally acceptable manner.