You might want to look at Vulkem #116 instead. The same colors as the #911are available, but #116 is suitable for continual immersion. I work for a company that sells Tremco products for the concrete industry, and we sell tons of the stuff to the pool builders in my area (Oklahoma City). If you go to Tremco's website you can find a dealer in your area. Out of all the different polyurethane sealants we sell, #116 is the only one I would use in your situation. It is probably around $0.50 per tube more, but worth it. Great product.... (by the way this is not a sales pitch)