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rustproofing

  1. Rustproofing?

    Auto Detailing & Body Repairs
    This is potentially a very stupid question, but anyway. I'm in the process of restoring a c900, and I've got a question about the under-body. Basically, much of the frame is covered in a thick, greasy, gooey substance. I'm assuming it's some sort of rustproofing, but I'd like someone to confirm...
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