>> reduces the bristle length making the brush a little stiffer and more precise
Or, using a scissors, cut off half the length of the bristles. Makes a much better brush for spreading adhesive.
I personally don't like wrapping in tape as I clean out my glue brushes and reuse them. I don't think I have bought a new acid brush in 25 years. I have 5 or 6 and they clean up just fine. If the adhesive dries in them, just put them into a cup of hot or boiling water for an hour or so and the glue will be softened and easily clean out.
The above works for all water based adhesives whether standard or Type II "water resistant". It won't work for Type I "water proof adhesives (TBIII) or epoxies. If the adhesive hardens with those, sharpen them up and use them for a chisel.