Fix Broken Headphone Band - Superglue Trick

Superglue on its own is not strong enough for this job. The tricks is to sprinkle some baking soda to form an instant cement.

Superglue (Cyanoacrylates, CA) + Baking Soda (Accelerators) = Super-hard instant cement (Exothermic reaction)

When baking soda(accelerator) is added, superglue will set almost instantly (5 seconds).

Add superglue to the surface and sprinkle with some baking soda. It will set almost instantly, about 5 seconds. Repeat the steps few more time for stronger bond. Do it on all sides of the broken area.

The broken part is as strong as original. The surface doesn't shrink, can be sand and paint.