Think of the ski, that the core is exposed at where the fin slot is and at the inserts and it does not absorb water. It won’t absorb water because of a ding. But I would repair it just to make it look good.
Mask it, remove the chips, sand it, put some epoxy, I would use the AB modified acrylate. Mask it again sand it, use some car putty, mask it sand it again and when you are satisfied with the result, mask it and spray it.
With black, or anthracite, or midnight black… or whatever you prefer. SEM Classic Coat is a good choice of spray paint.
Well… there were 2 skis that their fin slot was shield and had no inserts, because they had no foam core… so a ding would had been a reason to sink, but not on any other ski. 😊