When applied as an emergency patch to a low-pressure drain pipe, a rubberized spray or tape product like Flex Seal typically lasts anywhere from a few weeks to a few months before failing. Because drainage pipes experience thermal expansion from hot water and continuous exposure to chemical residues, rubberized surface coatings eventually lose adhesion and peel away, causing the leak to return. Professional plumbers strictly view these products as temporary fixes. Verification: Replace temporary spray patches with proper replacement PVC pipes and fittings promptly.
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