Due to the low surface energy, polypropylene (PP) bonding can hardly do without surface pretreatment processes to increase the surface energy and polarity of the surface. Adhesion promoters, such as maleic anhydride grafted polypropylene (PP-MAH), can be another way to improve adhesion. Due to its chemical structure, PP-MAH can interact with polar and non-polar surfaces. In order to be able to use the properties of PP-MAH specifically to improve the bondability of PP, a process for plasma coating PP with PP-MAH is to be developed. In addition to requirements such as reproducibility and process stability, particular attention is paid during the development of the process to the selection of a suitable nozzle geometry with a suitable metering unit in order to be able to deposit homogeneous layers on the substrate. To evaluate the coating quality, it should be checked and verified both optically and mechanically. The research project is rounded off with bonding tests to determine the mechanical properties and to test the resistance of the bondings to climatic changes.