I've been waxing skis for both myself (strictly recreational) and my daughter (semi-committed racing D-team) for the past three years, and thought I pretty much had it down (after some fairly ugly initial goofs, of course).
Recently I've seen something that makes me wonder, though. I've been cautiously increasing the heat and number of passes, in an attempt to get colder waxes (e.g., FastWax HS0 or HS10) to stick enough that scraping doesn't just pop off parts of the layer of wax I just laid down. At the same time, I've started noticing a kind of "structure" showing up in the wax, though. On my daughter's skis, this takes the form of a grid pattern, primarily up near the shovel of the ski. Note that as far as I can tell, the base is still flat: it's just that the pattern shows up because the wax cools at different rates in different places, and thus the grid, spacing between 1/8 and 1/4 in (so, 0.5cm?).
On my skis, it's different: I get a wavy pattern along the edges, again with a spacing of about 0.5 cm, where thicker and thinner areas of wax alternate. In this case, there is actually some unevenness in the base---that wavy pattern shows up in the base itself, faintly, but only right along the edges. These skis are new, and I haven't had them stone ground: just filed the side edges, started waxing, and started skiing. Putting the closest thing I have to a true bar to the bases, they're a little concave at tips and tails, and even very slightly concave in towards the bindings.
So, two questions:
1) In either case, do the patterns showing up indicate that I'm overheating the ski? I'm *still* getting wax popping off the base when I scrape, at least locally.
2) Is there any reason to think the wavy pattern along the edges on my skis came on the skis, as opposed to being something I'm doing to screw them up?
Thanks very much for any pointers or explanations: I really like how the skis glide and edge when I get it right, but the fine line between hot enough for the wax to melt properly and hot enough to damage the ski is still (obviously!) a source of some anxiety.