An idea that worked for me when I had a pair that delaminated is just four easy steps.
1. Drill three or four holes around the tip of your ski, maybe a centimeter back from the edge or so
2. Buy some thin, malleable (bendable) wire from a hardware store
3. Literally, lace up the tip: run the wire through the holes and wrap the wire between the holes and the outside of the ski.
4. Duct tape over the exposed wire, melt the duct tape with a lighter, and it should hold for a while.