[Bones]

I agree, you might want to test that stuff first before commiting to a run.

You could use the method I've used before by using a thin film of dielectric grease where you know or think water/condensation will be.
You don't need to glob it on, just get a film of it wherever needed and it should prevent a short. If you still want to use the foam, the grease would at least give it some protection - Only real drawback to the grease is well, it's grease and not the easiest stuff to clean off.