I like to use a nice thick electronics grade silicone sealant like Servisol, as it won't flow into the connectors and switch while it sets, I put a dab of silicone grease on top of the switch, then just cover it all bar the pins and the top of the switch with the sealant then put it back in the case to set.
For space or weight critical applications, I have been know to bind it, stick the pins into a block of blu-tac and 30min epoxy the whole thing up. That gives a fairly consistent hard coating to protect it in stead of the case.
I used to get short 10cm servo extensions, plug them in, bind the RX, heat shrink the RX with shrink that is longer than the RX, and plug the ends of the shrink tube up with Servisol electronics grade silicone sealant.
Unlike corrosionX or a silicone conformal coating I am happy running these methods under water, but all methods have a disadvantage; Using silicone in a case you cant replace an aerial, so if it gets damaged it is more work to fix it rather than replacing it. Using epoxy you could probably still remove an aerial with pliers and replace it, but it is forever more linked to that TX so if you upgrade your TX you need a new RX. Using extensions is big, heavy and expensive, but can be cut off easily without any tell tale signs should you need access/warranty.
Paul Upton-Taylor, Greased Weasel Racing.
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