Using liquid rubber spray or tape like Flex Seal is generally a temporary, unreliable band-aid for a leaking toilet tank, and professional plumbers strongly advise against it. While it may temporarily slow down water weeping from a cracked ceramic tank or rusted bolt hole, toilet tanks experience constant water pressure, thermal shifts, and structural stress. A cracked porcelain tank is structurally compromised and must be replaced entirely to prevent a catastrophic blowout and flood. Verification: Inspect the tank for hairline cracks and replace the entire porcelain tank or unit if structural damage is present.
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