How do you reseal between leaking glass blocks in swimming pool?

If the leak is in the Plumbing, you can get a qualified leak detection company repair the broken pipe, skimmer, or other area where the leak exists. If the leak is in the surface of the pool (such as a hole, or through cracks in the surface), coating the pool with a new fiberglass surface is your best bet. Fiberglass can be applied over plaster, aggregate (pebble-tec), vinyl liners, and virtually any other surface. You can see a video here:
http://www.advancedpoolcoatings.com/videos.html

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