I live in Kansas and I have a 14x24 concrete pool. It was built in 2000 so 15 years this year. Originally painted with Olympic Zeron Epoxy. I recoated 5 years ago with Proxolon 2 and it started peeling off the floor of pool after two years probably because I didn't prep properly. Walls are still fine. I'm basically down to the original coat on the floor. It still looks OK but I'm planning to repaint again. I plan to sand it down with a hand held power sander, acid wash and TSP. My question is should I repaint with Proxolon 2 or the Zeron. Any other tips for repainting are welcome! Thanks.