Thanx very much for your answers! I'll keep my reciever unwrapped then. Might get some corrosion X, don't know if I can get it here though.
I've also read that 2,4 recievers shouldn't me wrapped in foam due to reduced cooling? Is there any truth to that!
I got my new Futaba 10C two days ago, haven't had a chance to try it yet though. I used a 9C before.