I decided to share with you my experiment - the goal: water-resistant sting ray strap.
My old sting-ray strap started to produce quite unpleasant odor because of hot and humid summer, so my next strap was to be improved.
The idea - to make it double layered with inner and outer sides made from sting ray (i reckon if a sting ray lives in an ocean its skin should repel water?)
So, here is the result. Please don't hesitate to share your thoughts and ideas.