Thanks for your suggestion. I had not considered contact cement. I'll add it to my trials. Currently, I have adhesion tested Ambroid glue, Fabric glue, epoxy and 3M 5200 marine sealer/adhesive. I've been testing the adhesion of each of the above using a small piece of fiberglass placed on the underside of the deck. Currently, the best adhesion appears to be the Fabric glue. I have not tested the 3M material as yet due to long cure time for this material. There is not enough surface contact area to bond the hull and deck directly. The 1/4" balsa must be bonded to the ABS deck.