Slide the heat shrink tubing over the exposed wires.

Using the heat gun, slowly go back and forth over the shrink wrap, allowing for even heat distribution and the wrap to close.

Depending on the heat gun setting, shrink wraps should take anywhere from 10-25 seconds to fully constrict around the wire.

Heat guns take little time to heat up and much longer to cool down. Use caution when setting this tool down and make sure it's cool when picking it up after use.