There is a 10 inch crack along the wall of my fiberglass pool near the seat in the deep end. This crack was discovered last September by American Leak Detection when my pool was leaking. It was temporarily patched with some butyl tape and epoxy, and it doesn’t appear to be leaking currently. I’d like to get this permanently fixed though since I’m worried the pool could start leaking again in the future. I’ve called all around town and none of the local pool companies do repairs on fiberglass pools. A fiberglass tub company said they could fix it with some fiberglass resin but my pool would have to be partially drained, and water can’t be put back into the pool for 24 hours afterwards. This really worries me because I’ve read that the walls and floors can crack if they are left partially empty for too long. It doesn’t look like I have a hydrostatic valve or a sump pit to prevent this from happening. Does anyone know if there is a product available to fix cracks in fiberglass pools under water or that requires a very short cure time so water can be put back in that same day? Is there anything that can be done to decrease the chance that my pool suffers any damage from being partially empty for 24 hours while the fiberglass resin dries? It looks like it will have to be lowered about a foot under the return in the deep end which is a lot lower than it is drained during the winter when we close it.