I discovered a long crack in the deep end (6') of our fiberglass pool today that wasn't there last week. The crack is about 18" from the front wall and about 12" from the side wall and 8" long +/-. Any recommendations on what I can use to repair it. I live in eastern NC between Sounds and the Beaches so we have a lot of ground water along with a lot of rain this summer. I've been told it's not a good idea to drain a fiberglass pool all the way down since it can cause the pool to rise and crack from the pressure. I have concrete completely around the pool 5' on one side and 15' around the rest if anybody knows if that will help with draining the pool.
I need something that can be applied under water and will stay in place.
Any suggestions or recommendations will be greatly appreciated.