On Fri, 19 Oct 2007 20:53:25 CST, Phyllis and Jim
wrote:

The walls will become dark with algae fairly quickly. Would that
provide you with enough darkness? Woud there be anything gained from
the epoxy? Jim

Epoxy seals and keeps the pH down. Not really a color/darkness thing. ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us