What are the benefits of brushing before and after waxing and why are the ski-bases structured?
Before waxing: the use of a hand brush or a rotating brush, ideally in very fine bronze bristles, allows the cleaning of the bases even to the depth of their fine structures. This energetic brushing also produces a texture favorable to the impregnation of the wax.
After waxing (and scraping the wax if it is hot waxing): brushing is ideally done with a hand brush or rotating horsehair. This releases the structure of the base and polishes the wax.
Note that the ski-bases are not smooth but have fine longitudinal structures that reduce adhesion especially on wet snow. The structures will be less deep for the cold snows and more for the wet snows. Waxing, especially hot, fills these structures you need to release by vigorous brushing.
For universal use we strongly advise against deep structures that interfere with the handling of skis and snowboards.
If, during the maintenance of the ski base, you see structures on the edge, their disposal by sanding with a long diamond file, used with a guide of fall, is essential for a good functioning of the skis and snowboards.