Use heat shrink tubing to cover the connection which needs to be protected, then heated with an oven, hot air gun or similar tool. It also can shrinked by the heat from a soldering iron(held in close proximity but not touching the tube) or a lighter, these methods are convenient but less effective. This process cause the tubing to contract as much as one sixth of its original diameter(a ratio of 2:1 is the most common), providing a snug fit over irregularly shaped joints. This tubing provides good electrical insulation, protects from dust,solvents and other foreign materials, as well as strain relief.However, heat shrink tubing can melt, scorch or catch fire like any other plastic if overheated.

Some types of heat shrink tube with a layer of adhesive inner side to provede a good seal and better adhesion, while others rely on friction between the closely conforming materials.Please take carefull when you heat plain non-adhesive shrink tube to very near meting point, this may allow it to fuse to the underlying material as well.

Since the early 1970s, the tube was applied to cover fiberglass helical antennas in large quantities, and for 27 MHz CB Radio use extensively.Many millions of these antennas have been coated with this shrink tube.