just using cold temp wax good enough?
Good enough...for what?
If you've actually gone to the expense (> $500/lb.) and health risk of using high-fluoro waxes on a regular basis, and appreciated the difference, then you should probably be answering your question, not asking it. As the saying goes, if you have to ask...you probably don't need condition-specific, HF wax.
There are some excellent all-purpose waxes on the market these days. I have had good success with Swix F4 (which they used to make as a hard iron-in wax, but I'm not sure they still do--mostly rub-on/wipe-on/spray-on types now), and more recently, with Briko-Maplus "Solid Racing Base-Medium Universal" wax (available at Slidewright.com, here
), as well as Purl Purple all-temperature wax
. These waxes work quite well indeed over a variety of temperatures, all except extreme cold. Yes, you will potentially save a few hundredths of a second with the right
condition-specific and fluorinated (when conditions call for it) wax--but again, if that's important to you, you probably wouldn't be asking your question.
At least as important--and often much more--is the finish and structure on your base. But for most purposes, any medium-fine structure will work great. Keep your edges tuned, smooth, and sharp, and apply whatever wax you choose regularly, and your skis will work fine, in all but the most extreme conditions and demanding circumstances.
Finally, to answer your specific question, while most wax is better than nothing, I would NOT recommend an extreme cold temperature wax--as in CH4/LF4/HF4--for all-purpose. It is extremely hard to melt evenly and deeply into your bases, and harder still to scrape smooth--unless you have a very sharp scraper. When I use that stuff--which is rare--I sprinkle very thin shavings of it (made with a sharp metal scraper) on top of a universal base wax and melt it quickly with a hot iron. I would not think of using it as a base or universal wax.