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In this study, for the composite polypropylene in instrument panel, mechanical and chemical properties of primer-less waterborne paint is investigated by formulations of paint composition and material properties according to process conditions are also investigated. Primer-less waterborne paint with 30% of polyolefin modified acryl emulsion, 15% of alkyl methacrylate emulsion, 3% of cross-linked polymethacrylate bead, 2% of amide modified polyethylene wax had good adhesion properties onto polypropylene substrate without adhesion promoter and showed better properties on long term reliability test. In production line test, IR curing condition was insufficient for waterborne paint due to high latent heat of evaporation and complicated feature of instrument panel. Waterborne primer-less paint was sensitive to painting environment compared with solvent-borne paint.