On Mon, 30 May 1994, Marjorie W. Cleveland wrote: > The following question came from another bulletin board, but the > person asking for information received no response. > He has a leaky concrete birdbath, and is looking for advice on > how to seal the leakssafely, without poisoning the birds that > drink from the birdbath. > Anyone have helpful suggestions? > Get some aquarium silicone sealant from a pet or aquarium store. It's designed to be in contact with water, without outgassing toxins that hurt delicate creatures. I don't know how well it would do on concrete, but it would probably work OK if the birdbath was drained and completely dry.