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I have done the board trick, but be sure it is nonstick before glassing! Use wax paper in between the board and glass. At least that is what I have done and it works as long as you are careful. If all else fails, I have thickened some epoxy with micro balloons to get the layers to hang upside down. I only thickened enough to get them to stick, but still permeate through the glass for bonding issues. This is how all the guys glass the bottoms of wooden boats to avoid the swelling sequence. I have done 5 or 6 boats that way and they are still looking great after at least 6 seasons of full service. I am going to do this to my wooden skiff this next winter. Good Luck!