If you are not going to replaster the whole pool then don't spend a lot of time cutting and chipping. Just use a small angel grinder with a diamond blade and cut out a small area under the 15 feet that is sticking out (keep the are rough). Then use the grout that is used for the tile as mentioned above (make sure it is modified, it will have a bonding agent in it). Use a small margin trowel to apply the grout in the plaster make up area, then as it stiffens up use a small round piece of plastic (yogurt top or coke bottle works well) to smooth out and you can even shave a little of the grout off and re smooth if it to thick at the transistion.
As for the one to two inches that need filling on the bond beam the best thing to use is Quikcrete Fastset Repair Mortor (Home Depot or Lowes) www.quikrete.com/catalog/FastSetRepairMortar.html. In the two inch areas I would add gravel to the mix and I would install Tapcon screws to better anchor the cement to the bond beam.
Stainless Steel Lintel -Put stainless steel lintel 1/4 inch thick x width of bond beam x two inches longer than skimmer mouth opening in bond beam. Drill hole in each side of the lintel then Tapcon lintel to bond beam. Install linel so it does not stick out at the same level of the tile. The lintel will support any coping material so it will not crack. Hope this helps
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