I agree with Eamonn above.
CA is a useful item in the workshop, for filling holes, cracks, as a sanding sealer, as well as a finish.
I don't use it to glue in tubes but for a hard, clear finish it is hard to beat.
I only apply one or two coats on certain pens, especially segmented ones where colours tend to bleed as this is reduced if applied before sanding.
I have also used it to stop bleeding cuts on my hand.
If you have CA it is recommended to keep it in a fridge.