you have to scrape. have you ever waxed your skis before. im assuming your going to be using an iron? anyways just drip some wax on the skis...always better to have too much than too little...iron the bases until the wax is spread out on the base. always keep the iron moving on the skis. longer you iron the better, gets the way deeper into the base. now, i would HIGHLY recommend getting some fiberlene. with fiber lean you just rip a sheet off, set it on your tail or tip, put the iron on top of it, and slowly drag it to the opposite end. fiberlene absorbs the extra wax off the skis and any dirt. might take a couple passes but the end result should look very smooth and clean. if you dont have fiberlene then yes you have to scrape, and scraping sucks. just search youtube, theres a lot of tips and how too's, but defiantly invest in some fiberlene. saves a ton of time and gives a much better finish.
heres a vid showing a couple different ways to wax your skis
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