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Roland -- that seam is where the outer door skin (what they call the outside layer of sheetmetal) is crimped around the inner door carcass. In the long run I don't think there's anything that you can do about this. But you can still try... What kind of anti-rust liquid are you using? If it's something from Pep Boys or WalMart, you're wasting your time. I'd try only the POR products, and they can slow things down at best. Once you've POR-ed your seams, then seal them up from the inside. Make sure that whatever moisture gets into your car, and it will -- from the window seals if nowhere else -- won't continue to collect in these seams. Make certain that the door drains are clear and free.

You may ultimately have to give up. My '83 245 was in mechanically great shape when I got it 7 years and 100,000 miles ago, but it had rust pretty badly. I ended up getting replacement doors of the same (sorta) color from a southern wreck. I stripped the rusty doors, so now I've got spare window glass and latch hardware, etc. in case of vandalism or breakage.

Rob Kuhlman