Brian Gaff explained on 15/03/2019 :
As has been said, superglue is not going to work reliably, since the material
you are gluing is so powdery.
Some form of epoxy might well work, especially if you can build up a lot of
it on the inside to support the joint, while cleaning the outside.

Epoxy glue takes up space, forcing there to be an obvious gap at the
join. Superglue has the advantage that the item can be assembled first,
with elastic bands holding it together or tape, then the superglue
added. The glue will be drawn into the slight gap in the material and
any surplus is easily cleaned off. It makes a near invisible repair.