Inject liberally into veins switches, connectors, and other electronic moving parts that I'd like to be waterproof.
(0. Cover PCB in nail polish or specially-made products)
I used to use it with my hobo chiller of doom when extreme overclocking. I only use it to insulate the socket now, the board is covered in liquid electrical tape.
The hobo chiller of doom got upgraded to a water block glued to a peltier, and it's still hobo as crap.