I recently tore down a Radio Shack (I think maybe a Nikko), and found that the circuit boards had been coated with what appears to be paraffin wax, sprayed on.

I run Losi receivers (DSM) and they don't separate the connector area from the rest, so crud builds up in there quickly. If the crud is moist... you know the rest.

I just finished testing the first one, filled with very soft candle wax to the top of the connectors base. It works well.

Does anyone know why these things aren't potted during manufacture? It's not like they can be economically repaired.

Has anyone here tried this? Tips?