^^^ What he said.
If you really want to get your bases well impregnated, you wax your skis and put them in a "hot box" for 24 hours or so. It holds them at a temp where the wax stays melted. Overkill unless you're racing.
Personally in the fall I touch up my edges and give a good hot ironing with universal wax with an iron that's just at the verge of smoking. I use a very minimal amount of wax, but heat the ski up enough that the wax solidifies slowly. Let cool, and rub with a green potscrubber until the wax appears "dull" (Or you could pay 3x as much for Swix fibretex). This give you a ski that is very "slick" in 90% of conditions. I generally touch them up every 5-10 days or so after that.
For very cold weather (0F and below) I'll apply a temperature-specific wax.
It is possible to go nuts with riller bars to put temperature-specific structure into your base, but, well, I have better things to do...