A patching cement holds better than silicone. Moisture gets into cement and
can sometimes loosen the silicone.

Jim

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"adavisus" wrote in message
om...
(MVeerkamp) wrote in message
...
Can anyone recommend a sealer that will cope with small cracks in a
concrete
pond (built in 1969) Its a 20' X 15' freeform pond with Koi. Thanks!
I'm
loosing water like crazy.

I would have thought if it was a specific crack that could be scraped
out and cleaned up, the silicone gel used for joining glass to make
aquariums would be a safe bet, it should be fairly easy to find a
small tube for a specific small area

Regards, andy
http://www.members.aol.com/abdavisnc/swglist.htmlz