Sputnik, good luck on going nitro. It sounds like you got a good head on your shoulders and you will do fine.

Nothing wrong with a Cub, but the very reason you want a larger plane (wind) is the Cub's weakness. That is why it is considered an intermediate skill level. The ground handling really does suck...

To answer your question, the nitro engines are fuel and go. At the end of the day, drain the fuel out of the tank, and then run the engine dry. If you live in a humid area, a couple drops of after run oil wouldn't hurt. No need for a heatgun, unless it's below freezing.