This is not the cure for all dents, so dont expect to see good results with this technique if you plan on removing a dent caused by a collision with a deer
First off this is best used when you have some access to the back side of the sheet metal.
I recently jack knifed a 5x8 utility trailer while leaving work after an 18 hr. shift.
The result was a 4 inch crease in the sheet metal just above the rear bumper on the passenger side rear quarter panel.
I took a large soup spoon from the Fiance's silver ware drawer and slid it into the area behind the dent and patiently worked the dent out using a lever and fulcrum action. I found that if I tried to use too much pressure I distorted the metal far too aggressively but if I took my time and worked on the entire length of the crease uniformly I saw good results.
Once I worked out all the dent I could reach "limited only by the length and rigidty of the spoon" I decided to make my own tool that I could reach the rest of the dent with.
I decided on a piece of 1"x8"x 1/8" galvinized metal banding material.
First I chose the end of the metal strip that I would fashion into a spoon shape (A spoon has no edges to dimple the dody panel) I then heated the metal so I could easily pound a spoon shape into it with a ballpeen hammer. Be carefull not to over heat the metal because you could take the tempering out of the metal and it will then be too soft to use as a lever. After heating and pounding a few times I had the perfect bowl shape I needed for dent removal. To finish getting the spoon shape I used a bench grinder to round off the square corners of the metal strap on the spoon end. I also lightly ground the bottom of the spoon to a smooth finish to take out some of the dimples left from the ballpeen hammer. A good backer for pounding on would be a Piece of 2x6 wood, so you dont flat spot your spoon.
With my new tool I was able to get to the rest of the dent. I can't say I got all of the dent out, but I would say the results were good enough to go through the whole process again if I had to.
I have other little rock dings on my truck that I need to address, when I tackle them I will get pics (before*After) and also of the tool I made.
I know some of you are thinking it would be easier to call the dent wizard, but I am cheap and if I can do it my self I would rather go ahead and do it.