Hi all. Redoing my coping. The old coping came off in a 'chippy' kind of fashion. Wondering why there is a layer of about 1 1/2" thick cement on the top of the pool bond beam. Some of it failed and was separated while the rest is on there good. What should I use it build it back up? (The picture shows the tile which needs to be repaired too, the top row is missing)