Well, it depends on how the contingency clause was worded in the contract. Take this as friendly advice, not legal advice (still deciding on whether or not to go to law school). The contingency will usually say something like "The vehicle has been described to the best of our ability, and we shall make no guarantees to the condition of the vehicle henceforth." This covers their rear. And if the Carfax was clean, you would need to take it to a shop and have them submit a document that it does show non-factory paintwork - in their opinion. In other words, you're screwed. But, look on the bright side, most whom are serious about these cars know that stuff happens, and as long as the car hasn't been badly twisted, then you don't have a lot to worry about with resale. I think the only people whom this matters to are F-car snobs. Besides, even if it did make a difference in resale, then you would probably spend more in a legal battle than the resale difference, unless you represented yourself in small claims.