
Here's one every shop gets wrong at least once….. you glue up a nice wide panel, pull the clamps the next morning, and it's bowed like a potato chip, or there's a starved seam you can see from across the room. The dory needs a couple of solid-wood panels for the seat tops and a hatch, so I went back to the glue maker's own numbers and Fine Woodworking's clamping advice and wrote down how to do it right the first time.
Why it matters: A good edge joint with today's glues is stronger than the wood around it. But the glue only does its job if the edges meet tight, the pressure is even all along the seam, and the panel stays flat while it cures. Most bad panels come from the setup, not the glue.
Materials
- Boards milled to the same thickness, a little long and a little wide
- Wood glue: Titebond II for most shop work and anything that sees weather, Titebond II Extend when you need more time
- Packing tape or wax paper for the cauls
- A bowl of water and a Scotch-Brite pad, or a putty knife, for squeeze-out
Tools
- Jointer or a sharp hand plane (jointer plane or a No. 5)
- Bar or pipe clamps, enough to put one every 12" or so, top and bottom
- A couple of straight, stiff cauls (2x stock, jointed)
- Straightedge, pencil, glue roller or brush

Steps
- Lay out the boards for looks first. Shuffle them till the color and figure flow across the panel, then make sure the grain runs the same direction on every board so you can plane or scrape the whole panel one way without tearout.
- Mark a big triangle across all the boards. That cabinetmaker's triangle tells you the order and which face is up, so nothing gets flipped when the glue's on.
- Joint every edge square to the face. Dry-fit the panel with light clamp pressure. You shouldn't see light through any seam, and the faces should sit flush.
- Do a full dry run with the clamps. Set every clamp to length now. Alternate them, one on top, the next one underneath. A single clamp pulls the panel toward its bar, so alternating cancels out the bow.
- Space the clamps right. Clamp pressure spreads out at roughly 45° from each clamp head, so it reaches as far sideways as the clamp is from the glue line. On 6" boards that's about a 12" spread at the joint, so clamps about 12" apart. Narrow boards or edging need the clamps closer, or a stiff caul to spread the load first.
- Glue both edges and watch the clock. Titebond's own sheets list 3 to 5 minutes of open time for Titebond II Premium at 70°F, and 15 minutes for Titebond II Extend. On a big panel, that's the difference between a calm glue-up and a panic.
- Snug, check, then tighten. Bring the clamps up snug from the middle out, tap the boards flush, check flat with a straightedge, then finish tightening. Titebond says to use just enough pressure to bring the joint tight: generally 100 to 150 psi for softwoods, 125 to 175 for medium woods and 175 to 250 for hardwoods.
- Read the squeeze-out. A small, even bead all along each seam means you used the right amount of glue. None means a starved spot. Then either lift it right away with a damp, wrung-out Scotch-Brite pad using short rolling strokes, or wait until it goes rubbery (putty-like, roughly 10 to 20 minutes) and pop it off with a putty knife.
- Leave it alone. Titebond says 30 to 60 minutes in the clamps for an unstressed joint, and don't stress the new joint for 24 hours. I leave a panel overnight before I plane it.
How much pressure is that, really? A 3/4" by 36" edge is 27 square inches of glue line. At 150 psi that's about 4,000 pounds of total clamping force. That's why one pipe clamp in the middle won't cut it, and why a couple of extra clamps never hurt.
MOAM's shop note: Don't crank the clamps down until the glue runs off the bench. Over-tightening slides the boards out of flush and bows the panel, and a wet rag smeared across a seam just works watered-down glue into the pores, where it shows up as a blotch the minute stain or varnish goes on. Snug, even beads, and a light touch on the cleanup.
Sources: Titebond product sheets and FAQ (titebond.com), Fine Woodworking, "How to Glue-Up Joints: Positioning the Clamps," Rockler, "Clamping Tips for Edge Gluing Panels," and Popular Woodworking on Titebond's squeeze-out advice.
MOAM Out.












