Bird-safe waterproofing for birdbath

debtro(z5 IL)June 12, 2010

I have two birdbaths that developed cracks and won't hold water anymore. Other than that, they're perfectly good so I want to waterproof them. I figured the same methods that fill holes in pots to make small watergardens would work to waterproof the cracks in the birdbath. I've found suggestions for both Bondo and silicone. But are these safe for birds? If water is sitting in the birdbath and birds are drinking? If not, any suggestions? We get lots of regular "customers" and I'd hate to inadvertently hurt them.

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terrene(5b MA)

I have a concrete birdbath that is over 20 years old and has developed cracks too. A couple months ago I went to the hardware store and the manager recommended a caulk that is used in fish tanks. It is aquarium sealant, 100% silicone, and safe for fish. Haven't gotten around to repairing the bird bath yet, so I can't tell you how well it works!

Maybe I will do that in the next couple days, as it is supposed to be nice weather and it has to dry and cure for 48 hours.

    Bookmark   June 17, 2010 at 9:18PM
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Once you waterproof the birdbath, can you clean it well?

    Bookmark   July 10, 2010 at 10:41PM
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heathersgarden(6b/7a Mid TN)

After researching, the advice to use aquarium sealant seems safest. It doesn't contain any mold inhibitors that other silicon sealants have, and is very strong.

    Bookmark   August 5, 2011 at 11:15AM
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terrene(5b MA)

Funny you should bump this. I finally got around to repairing that bird bath about a month ago! The aquarium sealant worked GREAT. I applied about 1/4 inch bead of sealant and smoothed it flat with my fingers, which was probably too much. I don't think very much at all would have been necessary to prevent leaking.

The only weird thing is that the sealant is slightly shinier and darker than the concrete, but you don't notice that when it's full of water.

Also, concrete bird baths are difficult to clean anyway. I use a stiff scrub brush. The sealant hasn't made any noticeable difference.

    Bookmark   August 11, 2011 at 3:40AM
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