Ryan:

Use "West Systems" Epoxy Resin, Hardner and Filler. Buy the pumps kit so you can do one pump for hardner and one pump for resin for accurate mixing. I used the 404 "adhesive filler" and added one heaping tablespoon for four pumps of each hardner and filler. Mix it all up in a cup, suck it up in a large syring, then inject. I found that small circle patterns for the holes work the best - about the size of a full roll of masking tape with one hole in the middle. I was using some dinner plate size circles but those were too big.

Good luck!

Scott Laughlin
http://www.cooknwithgas.com/Sailing/Hobie_Repair.html