Use hydrolic cement to build it, that way, lesss sealing.

"Crashj" wrote in message
...
On or about Wed, 10 Nov 2004 09:12:06 GMT, "Mostyn"
wrote something like:

I am looking for a simple waterfall design can anyone help?

One thing I think I learned is do not waste your money on black
urethane foam. Use the regular lower foaming type from Home DeBigBox
and paint it black. The other stuff costs three times as much and
turns green.
"Seal the Falls!"
--
Crashj