Yes, boxer glue 100 is what you want and you are right that you do not need to drain the pool to patch it. When we found a couple of small rocks under my liner a year after it was installed (it apparently was in the sand and took awhile to work its way up to the liner) we put a patch on so that if it did rip through the liner at some point, it wouldn't leak. We took a small piece of leftover liner and patched it. It has held for about 4 years now. It is a little discolored (I think from the glue) but it has not come up any even on the edges.
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