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The bottom line is
- Self fusing rubber tape worked well, but several layers and it
appears that allowing a thin layer of water between successive layers
improves the seal.
- Cloth reinforced epoxy worked OK as an interim fix

The small residual leak I can live with (OK - this would not be
satisfactory for an inside leak, so I empty my catch bucket into the
eagerly watching plants once a week).


The real bottom line is that it will get worse, at a very inopportune time.
Sometimes you just have to fix it the right way.