Use the silicone sealant specifically sold for aquarium repairs. Don't apply it too thick, as it will dry on the outside & take forever to dry on the inside, & you cannot
use the item until there is no longer any off-gassing...only then it's safe & inert. The smell is acidic as it's drying, more irritating than dangerous, but definitely not
for any pets to be inhaling. It's non-toxic when dry.
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