We had our marcite pool refinished about five years ago with Diamond Brite. We've been very happy with it until now. We have a hole about the size of a dinner plate in the shallow end.(You can see the marcite, or concrete under neath.) The Diamond Brite is chipping away. We've been told that it probably wasn't bonded properly. Should we "wet patch" it or drain the shallow end and have it repaired that way. What about the pool "popping up"? Thanks for any help!