Try the following link for a tutorial on using Monokote. The techniques can be applied to almost all heat-shrink wrappers for our balsa/foam creations.
http://www.monokote.com/monoinst1.html
Perfect your technique on a piece of scrap foam first. Don't go directly to your wing, etc., until you're comfortable with the equipment and covering material. Covering is 90% technique, 10% materials and tools.
Note: Not affiliated with TopFlite. I do not endorse, nor decry Monokote. This is posted for informational purposes only.