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The original Aura H2O used the case to make it waterproof, hence the ring-seal on the door flap.
The "waterproofing" on the Libra 2 is an interior coating on the circuit board so a crack on the case has no effect.
A crack on glass will propagate often even without any stress, but not not so much on most plastics without stress.
Superglue isn't much good for most plastics and it or epoxy will peel off many. Glues for PVC and Polystyrene work by dissolving the surface. Acrylic aka Perspex uses a cement, though maybe superglue works. Superglue is odd stuff. It will peel off many plastics.
Polyester aka PET and Mylar can't be easily glued, though stuff is glued to them. You'll find tape splices or glue on bottles can be peeled off.
PTFE aka Teflon can't be glued at all.
Polycarbonate doesn't glue easily.
Epoxy is good to glue non-plastics!
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