I know some of this was covered last summer, but in case anyone missed it or just now looking, I bought a shrinking disc from John Kelly, a HAMB'er, and it works better than advertised and is well worth the price. I'm not bashing the Sunchaser product, because I don't know how well it works (or doesn't), but I've been working with John's disc this past week on a very warped and banged up hood and it does a great job. I'm no pro metal worker; OK with a hammer and dolly and torch, but the disc makes the job a whole lot easier. If you're interested here's the previous post link; http://www.jalopyjournal.com/forum/showthread.php?t=194149&highlight=john+kelly 51FourDoor Wade