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As the demand for TPO in the Exterior Automotive industry grows so does the need for a robust coating system. It has been determined that without the use of conventional pretreatment systems, paint performance on TPO can vary significantly. Much of this variance can be overcome by utilizing the proper paint process parameters. These include: washing, adhesion promoter, topcoat, film build, and cure schedule. This paper will discuss optimization of these various paint process parameters for maximum performance of a 2K polyurethane coating system on TPO.

Two possible approaches to reducing the VOC of adhesion promoters for TPO include: 1) Developing a means for lowering the VOC of solvent borne adhesion promoters while maintaining sprayability and performance and 2) Development and use of a waterbome adhesion promoter. Initial test results using both of these approaches have proven satisfactory when tested to an exterior automotive coating specification. While further testing is still necessary, these approaches have thus far proven themselves as viable methods for reducing the VOC of adhesion promoters for exterior automotive TPO applications.