See if you can find out what the material is. If ABS for instance, plumbers' PVC/ABS solvent cleaner followed by the cement may bond it good as new if applied correctly.
I am only basing that on trying it to edge bond PVC trim stock ("Azek") I was using as coaming bolster backing and found that after cleaning well with the solvent , applying cement and clamping for about 15 minutes, testing the bond proved the field of the PVC boards would break before the edge bond. I don't believe epoxy would have worked anywhere nearly as well.
On the other hand, if it's fiber-filled epoxy.... |