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If you look for a low solid content sealer, I would doubt that it would make it hotter. It also would not make it any more slippery. A high solid content would. Check out ProSoCo's website PROSOCO, Inc.
Your pool guy may think that evaporation of ground water through the concrete around the pool assists in cooling the pool.
I doubt it.
Sealing the concrete may help protect the surface from water within the surface freezing in cold weather and flaking the surface. Like the Qwap mix the original owner used when pouring my front porch. It's beyond repair, needs total break-up, removal and start all over.