I bought this 1987 Sable which was 1 owner till last year. I had a chance to put it on a lift yesterday. It is absolutely rust free after living through 35 years of Kansas City salt. I am not sure if it was driven much in winter. The car was rustproofed when new. I am not sure what kind was used but I don't think it was zeebart. The stuff is still soft and pliant (it was a warm 90 degree day) and sticky! My brother had to park a Taurus because the trunk lid rusted off it and that was 20 years ago. I know some dealers didn't like rustproofing because they said it got brittle, cracked and trapped moisture. Not the case with this stuff. I had the windshield replaced and the techs were amazed that there was not even any surface rust in the channel where the windshield sat. There was no coating there but it still looked like new. I hope to post pictures at a later date