These gimmicks don't work. a dent is metal that was stretched beyond it's flex point and is being held in the dent stage by damaged metal. Have I seen these gimmicks work, yes, but they don't show you all the details. The dent they worked with was a perfect dent. There are not many of those. What I mean by perfect is you could have put your hand behind it and popped it out also. You still have damage at the edge where the dent was being held in. The lack of shine on the test vehicle makes it easy to show this as a perfect repair. Do your own test with an empty soda can. Using your thumb, push the side of the can in slightly until it will not come back. You have just reached the threshold of flexibility. Now with a pencil or whatever, carefully push the dent out from inside the can. The dent will pop out, but look at where the edges of the dent were. You will see ridges. The paint and orange peel can partially hide these on the thickness of automotive metal, but the damage can still be seen. Stand back 10 feet and look across the hood and I bet that you'll now see a wave to the metal. The ridges create high spots leaving the dented area as shallow. Try this stunt on a more extreme dent and you'll see that the whole thing is a joke. If it were this simple, body shops and PDR techs would be out of work.
