Learned shrinking techniques in autobody class for an old school teacher. Heating an area and quenching definitely shrinks the area. Generally used when you can't access both sides of the panel (Like a hood). If you have a dent, or oil can, you heat the center and quench it. Gotta be careful that you don't heat it too much or you will harden the metal when you quench it. The shrinking disc is the same thing. Only you're generating the heat with friction instead of a flame. Much more even and controllable. If you can access both sides you can use a flat hammer and shrinking dolly or a flat dolly and a shrinking hammer. Hammer out the dent and then shrink around it.
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