I have sealed exhaust manifolds to heads with the hi temp copper silicone.
It should work.

"Marc" wrote in message
...
I am reinstalling a Force 10 Cozycabin Heater. I have to seal the seam
between the cabin top and the levelling shim ring, the seam between
the levelling shim ring and the insulating material, and the seam
between the insulating material and the metal flue cap.

What should I use as a sealant? I'm thinking Hi Temp engine rated
silicone?