To help clamping go smoothly when edge-joining boards, we devised an edge-gluing fixture (show below) that directs clamping pressure to the center of the workpieces. If the clamping pressure is not centered, it can result in "overpull" or "underpull," which cups the panel. You'll need two of these handy fixtures, one for each clamp-bearing edge. As an additional advantage, this fixture elevates the clamps off the panel surface, making it easier to clean up glue squeeze-out. We also made some 3" lengths of the fixture to align the individual boards. You'll need two of these for each joint.
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For more in-depth information on gluing and clamping, visit our Gluing and Clamping section in the WOOD Store.