How much clamping pressure do I need for glue-ups?

Wood glue joints need 150-250 PSI. Most clamps provide adequate pressure — the key is even distribution. For panel glue-ups, place clamps every 8-12 inches, alternating top and bottom. Too much pressure squeezes out all the glue and weakens the joint. The glue line should produce a thin, even bead of squeeze-out.

How do I prevent clamps from staining my workpiece?

Steel clamp bars can leave black stains on wood when exposed to wet glue (the tannins in wood react with iron). Use wax paper or parchment paper between the clamp bar and the wood. Bessey parallel clamps have protective pads built in. Alternatively, use aluminum bar clamps which do not cause staining.

Best Woodworking Clamps 2026