Slip a piece of shrink tubing over each of the exposed solder joints.

Use the soldering iron to apply a little heat evenly around each of the shrink tubing pieces until they are secured to the wire.

Do not hold the soldering iron to the shrink tubing pieces for more than a few seconds at a time. You may accidentally de-solder the wires or even break the shrink tubing.

We recommend using the side of the soldering iron when applying heat to the shrink tubing. The sides are cooler than the tips, and using the sides will also prevent solder from getting on the shrink tubing or vice-versa.