I've made/repaired my fair share of shot skis (they all have been waterskis however) but I just use a regular 2 part apoxy and make sure to clean the area really well before hand. I've been meaning to try marine grade apoxy with the thought it might hold a bit better against all the spillage and liquid but haven't gotten around to it yet.
in this picture you can see out standard 5 person slalom and out 6 person women's jumper. The Men's jumper was the 8 person ski but I don't have a picture of it.
the red one backwards on the wall is the 6 person.
and here is the makings of a Murdered out one I made two years ago (since then it's become a longboard ski)