There are many reasons one might want to brush-on cyanoacrylate (CA). And it is entirely possible to dispense some glue onto a brush or the workpiece and spread it using a stand-alone brush, as one would with paint. But it is more convenient in many cases to have a brush applicator, so i will show you my simple way of creating one. I'm sure you can take the concept and make it your own through customisation.
The fundamental concept for this instructable is to use heat shrink tubing to clamp the brush's bristles in place, and also clamp this 'casing' or ferrule to a glue dispensor, channeling the glue onto the brush head.
The glue has to be able to flow through the brush head. For this reason, the applicator might only be useful for thin (non-viscous) CA glues. However using thicker bristles in the brush head may aid movement of thicker glues between the bristles.
Before we get to stepping, here's what you will need (also pictured):
- Cyanoacrylate glue with a nozzle tipped cap or lid.
- Hair of some sort for the bristles
- Heat shrink tubing (a.k.a. “heat shrink”; or just “shrink”) used in electrics and electronics
- point heat source such as a cigarette lighter
- sewing thread.
I have an instructable on making (paint)brushes. The following steps are a foreshortened version of the instructions from that source, since the process is the same. You may like to view the full brush instructable
though - https://www.instructables.com/id/Make-brushes-such-as-for-painting/