Marc, as far as I remember, the Skygate Hawk has a vacuumed sandwich. This basically means that the inner layer has been layed up and covered with bidim/peel ply/absorbing falter.
The inner surface shall look slightly grainy. If not you can scuff it lightly with a perma-grit drum/ball passed at slow speed before gluing. In any case do not remove the inner layup.


By the way, the foam is called Airex. Nomex is an aramid honeycomb.