Just been watching a video showing a method to remove small dents by hovering a hairdryer over the area and then spraying it with liquid CO2. Anyone tried this?

I noticed a small dent below my door handle about the size of a 1 penny coin. I was wondering how i could remove it so i looked at that video,

Could i knock it out from inside, remove the door and knock it out?

It ruins the shine on my car!!! :cry:

someone had this posted up before... i think he went on to try it but found out it only worked on big dents....