i want to arm myself when I go to the deal and to be prepaid for any pushback on there part. Now I have a 2007c with 22k on the clock and I have a little rust spot on the roof. now I bought this car about 1k ago and I didn’t notice the rust on the roof. how is it possible that a car with no visible damage (rock chipping the paint) get rust. I have 20 year old BMW with no rust on it. How do I get the deal to fix that.