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Leaking birdbath

I have just noticed a leak in the birdbath. It probably doesn't help that boiling water is poured in it most mornings lately to de-ice. It is either concrete or reconstituted stone and I wonder if anyone has any advice on what I could seal it with that is bird friendly?
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One of those sealants that go round windows to seal the gap? I'd go to a building materials warehouse and see what they've got for sealing anything to concrete.
In the sticks near Peterborough
Thanks nut, I'm going out to scrub it because I can't see a crack while it's half full. I just know it's dripping.
Is it the birdbath in your avatar?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
It is Dove
. This turns out to be a waste of time because when I scrubbed it the whole top disintegrated
. I have put a pottery top on the remains for now but hope to get something to fit the base. Just realised that it is 10 years old - I'd have guessed three
. They should last longer though.
The robin who thinks this is his personal bath on the patio is in for a shock.
Time flies. But you're right, 10 years isn't long for concrete or reconned stone
In the sticks near Peterborough
Snap
In the sticks near Peterborough
My Ma-in-law used to make her own, with a length of drainpipe and an upturned metal dustbin lid coated with cement. Looked good, not sure about lifetime, but I guess could be patched up if need be.
It looks like to much ballast has been used