40,000 Z32s were imported. Those that had the misfortune of driving in salt should be allowed to return to their elements, i.e. any iron (steel) that has not yet become Fe2O3. The best repair is always replacement. There are plenty left in the non-salting states. Cars are dipped in chemical tanks to reach the inside of all the boxed sections. When welding on to those, where you cannot reach the back side, the iron gets exposed and a new rust clock begins. Post OEM paint jobs are thicker and softer and prone to chipping. This is a losing battle.., got to move on to the next project.