Soldering flux brushes work great for applying glue to small parts and tight spots. I used to go through a lot of them in the course of building a project, and that struck me as wasteful. Then I hit upon this remedy.

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Drill a 14 " hole in the cap of a disposable water bottle and fill it with enough water to immerse the brush bristles. The water keeps the glue from hardening. When you need the brush simply unscrew the cap and squeeze the bristles between paper towels. By keeping the cap in place on the brush, it holds the glue-loaded bristles off your bench when set down.
—Arthur Morse, Olympia, Wash.