Waterproof matches are yet another example of something that costs a lot more than it has to.
Turn normal matches into waterproof matches is easy by putting candle wax over the heads.
Leave a candle to burn down a while, creating a pool of hot wax.
After extinguishing the candle roll the tips of the matches in the still liquid wax making sure the wax covers the head and comes down at least three millimeters further down the stick.
Leave overhanging a ledge to dry.
To light your now waterproof matches, simply scrape off the wax with your finger nail and strike.