Originally Posted by tech69
this is also why you don't use those cheapie HF stud guns. They require too much heat to get the studs to stick. A good gun does it with a light triggering. I never had problems with the pressure but heat on newer cars no doubt. Had hail damage on a Subaru hood recently "get away" from me. I can't say for sure the little shrinking that occured during welding the stud in did it OR it was just stretched from the hail damage but once I got it straight the shrinking begun and in the end it was tight but with a bigger skim coat than I would have wanted. "It got away from me"
Never used a HF stud gun but I can't stress enough a tip taught to me by a serious tool inventor that using the stud gun you don't need much heat. I understand may be describing this exact thing, the HF doesn't even have enough to do this. I am posting this for any lurkers who haven't seen it.
This video shows how little a tap on the trigger you should need.