I just wanted to share. I'm working on a larger one for a birdbath, so this was practice. But it leaks, and the new one I'm working one has developed a big crack that leaks too. Serious question, will bees wax be a good choice to seal it?
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A 2 part epoxy will do you well. Make sure to clean all edges of the fracture to remove dust and grime, and make sure everything is dry before you start mixing.
I think wax would fall apart in any kind of heat with those forces acting on it. Good luck.
Are there risks of chemicals leaching into the water after it cures? Additionally, am I right in assuming I can sand the epoxy flush after it dries?
If you really worry about leaching chemicals you can get food safe epoxy. But I think that most stuff are really safe (boat epoxy) just use something UV stable.