I had a football shaped dent just above the back tire on my Eclipse. And no I couldn't get behind the dent. The dent was about 7 inches long and around 4 inches wide. First thing I did was start in the middle of the dent. Well, that did nothing. So, I thought I would try to work my way from the outer portion of the dent to the middle. After about 2 hours and around 40 trial and error pulls, that spot looks great. It does work, just be prepared to put in some time and have a TON of patience on your side.