Just a little thought,where I run my buggy we have some water. So I put my servos inside small ballons and they have kept nice and dry since then

and work fine. I also put my hump pack and reciver in side ballons as well LOL.
P.S. Even when I whent through 3" of salt water by accident DOH. Sized every bearing in my buggys drive train within 24 hrs doh. Lucky for me I put the engine in a container full of oil to soke so that it would not size up.
P.P.S. I now stay well clear of deep water lol.