Bird-safe waterproofing for birdbath
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.