You've probably already seen the trick about using the internal stiffener of a spent disposable foam brush for spreading glue, but here's a way to go it one better.

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You've probably already seen the trick about using the internal stiffener of a spent disposable foam brush for spreading glue, but here's a way to go it one better: I use my bandsaw to cut a series of small slots into the end of the stiffener to create teeth, as shown in insert drawing. The result is a groovy but consistent layer of glue, much like that made by a toothed trowel when installing floor or wall tile.
—Erv Roberts, Des Moines, Iowa