Paul
For the problem you described, it might work to use slow setting epoxy, heated to thin it. Pore the pre heated epoxy over the preheated wood and container. Pump a vacuum briefly and then apply as high a posative presure as your setup will handle until it cures. (My set up is limited to 110psi posative.)

Would experiment with epoxy viscosity and setting time at elevated temps first.

Just and idea
Pup (Gary)