Definitely cover it with epoxy to seal it up, moisture in your ski is bad news. JB weld makes a 2 part tube of clear epoxy that is good enough, but I’ve seen it discolor after a couple years. More expensive marine grade stuff would be better. Prep it by cutting the hanging part off and sand it like others said, then throw a coat of epoxy on it. After it cures you can sand it down a bit to make it smooth and less noticeable. Water in your ski can make it delaminate way faster and this is a quick way to prevent it.