Video: You have a glue gun, you want to glue some things, and you look down to see an option for high temperature and low temperature. What do you do? If you're anything like me, you go for high temperature, because high sounds like it will get done faster. Over on Tested, they take a look at what you're actually supposed to do. They recommend keeping separate high and low temperature glue guns instead of a variable gun. In this case, it's at least partially because it's easier to swap between guns instead of swapping between types of glue. As far as when you should use high temperature and when you should use low, it's all about permanence. Use low temperature when you're just tacking things together temporarily. Use high temperature if you want them stuck together more permanently.
Shop Tips: Know Your Hot Glue Guns [YouTube]