In my autos class, my teacher was talking about this. What you do is, heat the dent (hot enough to make it hot, but not enough to damage the paint), and put a piece of ice on the dent after causing the metal to shrink and pop out. He said that it works great on something like hail damage but you're SOL on a crater or something serious lol. Just wondering, has anybody done this and what were the results? TIA for replies.