In January I had my entire clutch system replaced. One component was a defective clutch master cylinder that leaked DOT-4 onto my chassis. About 3 months ago I was driving home from a friend's house one evening when the pavement on the higway turned white for almost a mile. When I got home the 11 o'clock news had a story on that there had been a hazardous waste spill on the highway. Something about a truck had spilled some sort of zinc-oxide waste from a local powerplant. Sure enough when I went out into the garage I had the white/gray-ish gunk still sticking to the bottom of my car. At the time I did the best I could to wipe the stuff off. Fast forward to last week. My speedometer stopped working due to a worn speedo cup. When I removed the tire to replace the cup, I noticed a fairly good blanket of rust covering the chassis that had been exposed. It's only rained once here in the time since, but my car wasn't out in the storm. So my questions are these: 1. Where else should I start looking for rust? (when I get the chance, I'll probably remove the access panel to the gas tank to have a look around there). 2. How difficult is it to work with POR-15? (are there any tips out there that any one can give me?) 3. What exactly is this zinc stuff? I know that the DML is host to many owners that come from all professions, so I didn't know if someone out there might know not only what this stuff is, but what it can do. Since it was considered hazardous, could the epoxy undercoating be compromised (called the news station, and they were no help). Thanks in advance! -Robert vin 6585