This has to be a must buy for any paddler. The Black Witch glue is perfect for repairing rips, tears and nicks in spraydecks, wetsuits etc. I always have a tube kicking round just in case and have in the past made some substantial repairs to a couple of my Playboater decks.
Once open the glue within the tube can go off fairly quickly. Keeping it cool (even in the fridge) can help prolong its shelf life.