Heat guns are made for scraping off paint at 400 -600 degrees. They last for a serious long time. Mind your electric bill tough ;) But yes you can use let it on for a long time. You are incontrol of the gun by waving it across your panel keep distance for temprature control. Go closer to add more heat. You are in control with this method not the heat gun. The more expensive types of heat gun do have temprature settings. But in my opinion it is not woth it.