Those little metal-handled bristle brushes sold as flux or acid brushes make great glue brushes. They spread the glue evenly and cost about a dime apiece. If you're not careful where you leave the brush, though, you can wind up with a trail of unwanted glue spots on your work or your workbench. I solved that problem by taping a small rare-earth magnet to my glue bottle to hold the brush there temporarily during assembly.
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