I have used the services of one of the local Paintless Dent Removal (PDR) places. They use a heat gun to soften the paint, to reduce the chances of it cracking and flaking away. They will generally go in behind the dent and push it out from the inside, using a "bodyman's spoon" or another pushing implement. Sometimes they push out more than they need, and have to recess some part of the former dent again.
It seems to be a real art form to me.
I have significant doubts that you would get good results from the glue gun approach, and I would be astonished if you could even get something that looked good at 50 MPH from 50 feet away (a "fifty-fifty job") by using one of the suction cup thingies.
-soD
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