The best wood glue depends on the joint and water exposure
For normal close-fitting timber joints, use a PVA wood glue such as Everbuild 502, Duo 2 in 1 or Cascarez Fast Grab. Choose a D4 adhesive where the joint needs a higher level of water resistance.
D3 wood glue is water resistant; D4 is the higher water-resistance class
Everbuild 502, Duo 2 in 1 and Cascarez are D3 wood adhesives for general joinery and moisture-resistant timber bonding. Everbuild D4 Wood Adhesive and Lumberjack 5 Minute PU Wood Glue meet EN 204 D4 for more demanding water exposure.
Use polyurethane wood glue for fast setting and slight gap filling
Everbuild Lumberjack 5 Minute PU Wood Glue is a moisture-curing polyurethane adhesive that sets hard in around five minutes and foams slightly as it cures, helping with small irregularities in the joint.
Cascamite suits demanding exterior joinery, laminating and load-bearing work
Cascamite One Shot is a powdered resin adhesive mixed with water before use. Its gap-filling properties make it useful for gates, doors, windows, garden furniture, laminating and other demanding timber joints.
Clamp close-fitting joints while the adhesive develops strength
Wood adhesives work best on clean, properly prepared surfaces. Follow the individual product instructions for open time, clamping and full cure; the correct method varies between PVA, polyurethane and powdered resin adhesives.