First, heat the center of the heat shrink tubing to wrap it around the pipe and make it snug. The remaining parts of the heat shrink tubing will tilt to both sides, and the crests and troughs of the central part will be obvious. When heating, the nozzle of the heat gun should be about 5-10 centimeters away from the heat shrink tube to avoid scratching or breaking the heat shrink tube with the heat gun. Swing the heat gun evenly up and down during baking to ensure the hot melt adhesive substrate melts evenly and shrinks.

After tightening the center section, gradually bake the two sides using a flame gun. The handheld flame gun should be swung back and forth. Avoid keeping the flame from the nozzle of the gun in one place or continuously baking a certain area, as this will cause the heat shrink tubing to heat up quickly and cause carbonization and cracking. When baking both sides, don't rush; bake gradually from the inside out. During the shrinking process, it's clear that the crests and troughs of the pipe are tightly connected to the heat shrink tubing, and there should be no bubbles in the center before the heat shrink tubing is evenly and firmly attached to the pipe.