I have a 93 sunfire SE, with the headgasket blown. ($800). There is an ad in the paper for some guy who will fix them for $300 or less. He says he puts in some sort fo resin or epoxy or something that fills the hole in the head gasket. He says it works in about 90-95% of cars. If it blows again in the first 90 days, he'll come do it again. If it blows again (in another
980 days), he will give the money back.Any thoughts? Anyone done this?