...as this relates to cars...

I hired a guy from Kansas many years ago. He told me that one of the things you get good at is shrinking the dents from hail storms, by heating them with a torch, then hitting them with a wet rag or ice. He said after a few dozen jobs, you can often get them so straight, you don't need any filler!

....which was a skill that is totally useless in Tucson, Arizona. :-)~