I've had an underwater MP3 player for about 7 years.  After using it regularly I let it sit in a drawer for a year and when I next tried to use it it's wires had turned brittle and the plastic literally crumbled off of the metal on the wires.  I used this liquid tape (a few layers) to recoat the metal wires and so far it's worked like a charm UNDERWATER in a pool.  Perhaps I'll revisit this review later and give more info after a few months, but so far I'm amazed!