I have a 40+ year old fiberglass side pool with a gunite bottom. Several years ago we had a company that came in and spray coated the entire pool with a fiberglass chop gun. The concrete coping is now really starting to look bad. It has many pits and a few cracks that are developing. Any suggestions on what/how to replace it? Pool is in a northern state (Michigan). Tried a couple local pool companies and they are not into major work like this.