TO PROTECT THE CARDBOARD TUBES AGAINST WATER IN THE TEST, WE WILL ADEQUATELY COAT THE HALF TUBES IN GENERIC SURF BOARD WAX. THE COMPOSITION OF THIS WAX IS COMPLETELY NATURAL AND IS BOTH CHEAP AND QUICK TO PRODUCE. THE THREE INGREDIENTS REQUIRED ARE BEES WAX, TREE RESIN AND COCONUT OIL, WHICH IN TURN PROVIDE THAT PROTECTIVE COATING WE WILL REQUIRE.

16.03.2014 - http://www.wikihow.com/Make-Surf-Wax