Hi David,
I’ve used corrosive X on receivers & servos but in all honesty I can’t comment on how good it has performed.
I’ve not used it in side my tx though.
Before considering corrosive X make sure the boat is watertight in all normal conditions. To me C X is the bolt after shutting the door.
After sailing ALWAYS allow the boat to breathe by removing a hatch cover or patch & only refit just prior to sailing again & you shouldn’t have any corrosion issues.