Question: What can I use on the edge of my paddle board to waterproof it ?
Options:
You can spray Plasti Dip on the edge of the board, use painting tape to protect the rest of the board so you won't spray Plasti Dip where it not needed.
You can spray black paint  on the edge of the board, use painting tape to protect the rest of the board so you won't spray black paint where it not needed.
Answer: You can spray Plasti Dip on the edge of the board, use painting tape to protect the rest of the board so you won't spray Plasti Dip where it not needed.