Double-back your buckles as on a climbing harness?
If you can weave the strap around the bars in the buckle differently, you can change the level of friction at the expense of convenience. Here's a common 4-bar buckle:
You can add some friction by tucking the loose end upwards under the top bar (double-back):
Or you could rethread it a couple ways (These ...
I learned this tip from a former Navy Seal.
Dip your finger in rubber cement and rub it on the full length and width of web straps. Both sides. Let it dry, then rub off whatever comes off. It adds a tremendous amount of "stay power" to your straps.
I added a bit of velcro to my shoulder straps with hot glue and it's worked perfectly. Get velcro at any fabric or craft store.
These are for my shoulder straps, which often slipped when I took big steps down on a descent. I added a small (1.5") piece of the "hooks" velcro to the end of the strap and then several inches of "loops" ...
Nordic skis and alpine skis have very similar bases, and kick wax doesn't do any damage to the P-Tex bases of classic nordic skis. It's just wax. If anything, one might argue it's somewhat good for your bases, in that it keeps them covered, but I don't want to get dragged into debating to what extent ski bases actually oxidize or age in the air.
The guide ...