My favorite gadget for applying glue is made from a cheap plastic spreader for auto body filler. This is simply a flexible, plastic rectangle into which I cut a series of 1/16” x 1/16” notches along one edge with a leather punch. Use the spreader like a putty knife, and the notches will leave perfect beads of glue on the surface. To clean up, just soak the spreader in water until you’re done clamping and then scrub lightly.
– Allen Grantham