West Marine is overpriced but not necessarily overkill. All you need is a fiber cloth or mat, cloth is stronger, and a resin, epoxy is more flexible than a polyester resin. Both resins will work. The biggest issue is making sure the area repaired is clean and dry, and that you don't add in any pockets of air during the repair.
You can get the products you need a an automotive paint store, an O'Reilly Auto Parts or even Wal-Mart.