Four different prepaint materials were provided by collabora-tors from industry. The first three materials, identified as Material#1 to Materials #3, were coated with polyvinylidene flouride(PVDF) resin (the contact surface) on top of polyester primer. Thesubstrates were either aluminum or galvanized steel. Material #3was embossed with surface texture. The average number of impres-sion was about 8.7 per square centimeter. The impression depthranged from 0.2 mm to 0.41 mm. These materials were commer-cial products used for metal roofing application. Material #4 had apolypropylene coating on tin-coated steel substrate. The materialwas not a commercial product and was obtained from a pilot coat-ing line. A main interest was to compare the performance of thiscoating with the commercial PVDF coatings. A shear was used tocut the materials into specimens having 38.1 mm in width. Table 1 summarizes the test materials