Ive done it tons of times.
don't prime it, don't clear coat very much
I had a whole thread that I explained it in but I can't find it anymore because of the new searchbar
Basically, start out cleaning it with some grease cutter and if you have it, denatured alcohol.
sand it to make it a little rough, with like 100 or 120 grit sandpaper. not too rough.
Spray like 5-7 VERY light coats of KRYLON BRAND FLAT WHITE
the last coat should be just enough to cover up the graphics. The idea is that you spray so thin that the paint dries almost instantly upon touching the ski. You don't want wet paint that will set up into layers that will crack and flake off when the ski flexes.
after that, wipe it down with a dry cloth and use sharpies to decorate it.
then, use a VERY LIGHT coat of clear coat to seal the sharpie.