Here's a picture of a pair of pliers my father made for forming the edge on the fenders of his race car, back around the time I was born. It's beenThanks guys. All good stuff.
just sitting in his toolbox for about 55 years.
It was used on .050" aluminum. It could be used on steel of significantly lighter gauge. The trick to using it is to not get 'greedy'. Take many, light passes, overlapping each squeeze by about 1/2. (It's the same way with hammer forming.)