The best sealant for copper pipes depends on whether you are working on supply or drainage lines. For threaded brass-to-copper fittings, Teflon (PTFE) tape or professional pipe thread sealant compound (pipe dope) applied to male threads provides a permanent waterproof barrier. For soldered copper joints, plumbing flux combined with lead-free solder creates a permanent metallurgical bond. Avoid exterior rubber patch tapes for permanent pressurized supply line repairs. Verification: Pressure test all sealed copper joints with water before hiding them behind walls.
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