Wow, sorry to hear of your dilemma. I had the same type of pool (concrete base, "Acrylic "- ie fiberglass - walls). The seal between the wall panels started to leak after about 5 years and the gelcoat on the fiberglass walls started blistering around the same time. I researched this for a couple of years, basically arriving at 3 solutions:
1. Fiberglass over the whole thing (walls and floor, as the concrete needed replastering anyway)
2. Install a vinyl liner
3. Gunite over the walls and replaster the whole thing.
I couldn't get anyone to do 1. or 2. (1. was my preferred choice at the time).
I ended up going with 3. And boy am I glad I did. I lost about 8" around the entire pool so its a little smaller now but it looks like a real pool. Here, in reverse order, are some pics on the before, process and after results:
View attachment 85053
Let me know if you want more pictures.
I do want more..
So?? You kept the floor & shot new walls??