RE: Nitroplanes Canadair Twin
You can dip them in epoxy, but then they can't cool off as well.
If you open up the back of the necelle to let air in the front and a little out the back I'm sure you'll be fine. They come shrink wrapped all up, so unless you dunk them, they'll work.
If you crash the plane, the ESC is the least of your worries.