i tried it on my sisters 99 grand am she had a dent in her fender i went thro a whole can of the air and didnt see it budge : (

 

that is highly unlikely to work. i work in the paint dept of a collision center and have repaired and restored cars for myself and others since '89. the theory is there but the hair dryer falls short in delivering enough heat. you could leave it on there all day and it wouldnt get hot enough. Unless you were in the desert, and then how would you get power for it?? a cordless extension cord?? lol... anyways..if its a round dent without creases, using a heat gun(like a hair dryer but produces heatnear 1800 degrees)to heat it up but careful to not burn the paint, get it real hot then hit it with cold water via towel, glass, pump bottle, etc,.. it should pop out... only thing is... the round uncreased dent wouldve prolly popped out if you just used the heel of your palm and pressed firmly working from the shallow edge of the dent on the backside if accessible.in the end... kind of a waste of time buta cool science experiment

 

 

Yes, that is how the dent guys do it here.

They use a small butane torch.