The coatings on Material #1 and #3 are both PVDF. From Fig. 9,it can be observed that Material #3 has significant localized damage (pointed by the arrows in Fig. 9(a)) as the textured surface has a smaller real contact area thus a higher contact stress compared to the non-textured surface. Since the strength hardness of polypropylene is lower than that of PVDF, the surface damage of Materials #4 was more significant, as can be seen in Fig. 10, than the damage on PVDF.