It's always handy to waterproof your RC kit because your toy car is going to tread in a lot of dirty - and sometimes wet - ground. This means that any electric circuitry faces the risk of coming in contact with water and fizzing out.
So keep things safe by learning how to waterproof the receiver for your remote control car.
Your receiver will be so waterproof can be dunked. Please note that this will not work on salt water. Keep your kit out of salt water.