: john,
i found a place that sells sheets of closed cell foam for $5.00 a 4x8 sheet or a whopping $2.00 for a 2x8 sheet. its in knox indiana, hitman...south bend indiana
Is that minicell or a closed cell like blue sm? If it is the minicell I would like to know the address -- that's a good price even with a lousy Canadian dollar and shipping.
As for the hatch cover, the edge needs to be sealed and epoxy is tougher than varnish so I epoxy mine.