Anyone tried this stuff? My Saab 9000 Turbo winter beater blew a head gasket, I was just going to junk it because I'm not throwing $900 at it to fix the gasket. However I came across this ThermalWeld crap, a newsgroup search just turned up a bunch of spammers promoting the company. There are no "Authorized ThermalWeld" mechanics in my area, but they offered to send me the chemical for $150 and said my local mechanic could put the junk in. They claim a 90%+ rate of fixing head gasket leaks. If I could fix it for under $200, I'd like to keep the car, it's really not a bad car.