I would use a slight smear of silicon dielectric grease. 

I used that on the air filter gasket surface, too.  And I had a problem with the air filter sliding into the airbox when I did the valve adjust : it just didn't feel right and there is no way to visually check to see if the air filter was properly  sealed after sliding it in the air box.  So I secured the air filter to the holder with some small sheet metal screws before I slipped it in the air box.  Felt a lot more "proper" after I did that.

I managed to survive the Twisted Trophies intense hazing to obtain membership this year in Arkansas! I showed up and met members, and it was a done deal! Good folks and good times!

Hi Conan and to the Club !

  Conan. I'm sure you're looking forward to all the enjoyment that your "new" toy will give you.

  As the saying goes. "Sit back and enjoy it". Cheers.

Actually, I have another picture from earlier that same day that shows an empty parking lot save for a lone Blue Trophy parked further away from the building.  Take that Silver Tongued Devil!