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The colour painting of polypropylene bumpers has required development of a new polypropylene surface treatment which provides improved adhesion of the paint film to polypropylene. According to the results of various improvement studies on the application of plasma treatment, it has been discovered that surface treatment by means of plasma of an oxygen and nitrogen gas mixture activated by microwave (2,450 MHz) provides a remarkable improvement in adhesion. Furthermore, establishing a technique to diffuse plasma effectively within the treatment chamber has enabled a uniform surface treatment of several polypropylene bumpers formed in large and complicated shapes.