Reminds me of being in the university dorm walking down the hall. One of our guys was in there waxing his skis, and setting the wax on fire. I just never saw anything like that....and he did it so skillfully. Such preparation looked like a lot of work though, but he seemed to think it was worth it.
Yes, several times during ski season, you need to heat up and remove the old wax so new wax appropriate for the type of snow you're in will adhere to the wood. What I basically remember is that I usually needed blue wax for snow conditions in the Rocky Mountains.