Perforation Corrosion Resistance (VTS Template 3.2.1.7.1.1). The vehicle shall not incur corrosion induced perforations of any body panels within 10 years of exposure to the required corrosion environment. Body panels include both non-structural and structural panels.End-of-test checks for actual perforations are not sufficient to validate field performance. At a minimum, no metal loss (loose/flaking corrosion product or noticeable pitting of the substrate after media blasting the corroded area) is permitted on any sheet metal panels at end-of-test. If any metal loss is observed, additional analysis will be required, and must be conducted with the assistance of GM Corrosion and/or Materials Engineering. Refer to Appendix C for the metal loss measurement procedure.