When enough glue has been added, apply heat from the lighter or other heat sources onto the heat shrink.

Be sure to apply heat in a back and forth motion. Alternative heating option can be hair dryer or heat gun.

Glue oozing out the sides is a good sign that you’ve applied enough.

Warning! Open Flame. Do not hold the heat source to one spot of the heat shrink or you will risk burning and damaging the cord.