For a permanent fix, you should never rely on exterior surface sealants, but for temporary emergency patches on low-pressure lines, you can apply rubber repair tape, stainless steel pipe clamps with rubber gaskets, or epoxy putty. However, these are strictly short-term band-aids. The proper permanent repair requires cutting out the damaged copper section and soldering in a new coupling or using push-to-connect fittings after shutting off the water supply. Verification: Pressure test the repaired copper pipe with water to confirm zero leaks.
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