Steve, do NOT buy a regular boat repair kit. I own a 17 foot Coleman canoe made in the late 70's. They used polypropelene for their shells and most kits, regardless of what the packaging claims, do not stick to that material for long. You will patch it and it will leak in about a month.
JB Weld makes an epoxy called Waterweld. Most sporting goods stores carry it. It's in a small plastic cylinder. It's about $3. It turned out to be the cheapest way to patch my Coleman canoe and it's the only one that's held, and that includes a professional plastic weld and fiberglass applied at a boat shop. Check Wal-Mart and Academy in the boating section.
Good luck.