I always double-patch. First patch is about an inch or two bigger than the hole all around, second is MUCH bigger, about an inch to 2" bigger than the first patch. "Boxer" brand glue works best for underwater patches. I use a rubber tile roller to flatten it and get the edges.
For me, a GREAT investment was a full-length wet-suit, with boots, hood and gloves--and weights. That way, I can get it when it's cold comfortably and work. It's not an expensive suit, or gear but it's perfect for the job: fixing my pool's leaks.
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