it makes perfect sense that it should work.
you heat to expand the metal around the dents boarder
then cool from the center outward to contract the metal
toward the center, thus pulling the dent out of it's boarders.
of course it probably only works on these type of dimple dents.
This has been around for years only it was used on BARE sheet metal with a torch and water. I have it in old autobody books. This will work in the way shown if the dent is in the right area. If it is near any corners or creases it won't work. It also depends on the degree of the dent. One good thing about this method is if it doesn't work your only out 15 minutes and a can of duster. if it does work you just saved lots of $$$$
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