1, hot melt glue gun is good or bad, the leakage amount of glue is an important evaluation factors. Good glue gun, muzzle Department has steel ball and spring design, this not pull the trigger when the steel ball can muzzle blocked to prevent glue leakage. Glue gun for this design, long standby leakage very little or even no, no such the cheaper glue gun design, standby circumstances would have been a lot of leakage glue. 2, how much glue leakage, but also the intensity and amount of glue, pull the trigger. In a sense, any glue gun will drain the glue, to see how to understand the leakage glue. We said gel does not leak, refers to the long-term standby, heating part of the glue in the chamber has no pressure increase was completely melted, the chamber filled with glue and does not leak.