Forgive the slightly unusual topic, but I'm wondering if anyone on the list 
has any expertise in how to safely seal an existing in-ground concrete 
birdbath.  I made it out of Sakrete sand mix, and it's been very popular 
with the birds, but it's a bit too porous and loses water due to seepage.  
I probably should have built it with a liner, but now I'm trying to figure 
out a way to seal it without starting over.

Sakrete makes a "cure and seal" product, which is a water-based acrylic 
that would probably do an adequate job.  But the manufacturer was unable to 
advise me as to whether or not this would be safe enough for the birds 
(i.e. will it leach into standing water, and if so, would it be toxic?).  I 
know there is a safe epoxy-based product out there called Pond Armor, but 
it's very expensive.

I'd appreciate any advice anyone has!  Off-list may be more appropriate for 
this one.

Jason Waanders
NW DC
jwaandersATstarpower.net