No, you should not rely on spray-on rubber coatings like Flex Seal to permanently fix a leaking plumbing pipe. While spray sealants can provide a very temporary, short-term emergency patch on low-pressure drain lines, they fail to adhere properly to wet, pressurized supply lines or oily PVC surfaces. Internal water pressure and thermal expansion will quickly cause the spray patch to blow out, leading to renewed flooding. Verification: Replace temporary spray patches with proper replacement pipes or fittings promptly.
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