Epoxy in filling of Coral cores?

[Walt Jaap STP]

Replacement plugs for coral cores have been constructed from portland cement
and secured in place with hydraulic cement and marine epoxy, both have proven
successful and coral will grow back over the filling.  You can also backfill
the core hole with appropriate limestone rubble and put a patch of hydraulic
cement or epoxy over the top.  

Marine epoxy in small quatities can be purchased from a hardware or boating
specalty stores.  If you are purchasing huge quantities, then give Neptune
Research, 561-683-6992 a call or Jack Villas and Associates at 800-255-4643.
Good luck.