by 
Anonymous
ANSWERS: 3
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Reduces friction.
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It protects the skis, and gives a faster, smoother ride. For more information see this excellent article: http://www.answerbag.com/articles/Why-Do-You-Need-to-Wax-Skis/68af75fe-09ae-8b55-bcd6-77f6ea37284f
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To make them slicker. I suppose it also protects the finish on the ski.
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