haha, i was gonna quote that same line. sealing, no heat transfer. it may be carbon bonded which would help, could have some heat transfer but i doubt it.
probably copper would be a great option except I doubt that face porvide seven enough pressure to seal anthing besides a pretty pliable plastic. On top of that maybe some sealer would work, some silicones especially the copper silicone have pretty good heat transfer.
honestly if that's the back face it probably doesnt represent that big of a % of the total heat transfer anyway, at least not while moving