If it's an off-road car we never bothered doing any waterproofing, you don't tend to get much water inside the shell as they seal pretty well to the chassis/undertray, plus the water tends to drain through the track rather than sitting on it.
If it's on-road (tarmac) you will need to waterproof the electrics, as the water sits on the tarmac and gets into the car when you race. Bluetac and balloons are what you need for this (put a balloon over the receiver and cable-tie the end up). For the ESC, you really need a proper waterproof one, as they don't like having balloons put over them (they overheat).
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