I am replacing the old concrete around a pool with new pavers. The coping is in good shape and is remaining in place. This is a first for me, and I have received conflicting advise on what to do between the pavers and existing coping. Everything from an edge restraint with foam backer rod and self-leveling caulk, to nothing but leaving a slightly wider gap for the poly sand. So, what is the correct way to install the pavers next to the existing coping?