i actually used it today, and didnt see it slowing me down. It was my first day on my new skis, but they seemed to slide really well on rails and snow. if you dont have any other wax, this might help your skis more than it would not
i use parafin waw, its used in cooking, candles anything really and it works, also i don't scrape the extra wax off my skis i just let the snow do that.