The ads are getting more and more common. Information about them is plentiful except for the cost. Just wondering if anybody has experience with them? In the 70's I bought a new car along with the dealers "Undercoating." The written warranty had lots of promises about what they would do if a panel rusted through. Lots of lawyer talk too. After a few months I noticed the tiny print saying I could only file 1 claim, and they would do the repair or refund what I'd paid for thw wonderful undercoating at their option. Well, I'd been had.