Many have asked how to chamfer the top edge of your side wall skiboards to avoid chipping of edges.
Some riders use fine sandpaper on a wood block and sand the entire edge with a radius. I prefer to use a fine tooth file and chamfer the edge at approximately 45 degrees and 1/16 on an inch wide. I hope the attached photo help you understand the desired result.
Note the chamfer on the top skiboard verses the "factory" chamfer on the skiboard below.