- 1). Turn off the water supply to the leaking copper pipe. Turning the water shut-off valve's handle counterclockwise closes the valve.
- 2). Open a sink faucet or hose bib to drain the water from the leaking copper pipe.
- 3). Clean a 1-inch section of the copper pipe on both sides of the water leak with either sandpaper or a wire brush. Remove all corrosion from the pipe's surface. Extend the cleaned area around the perimeter of the pipe.
- 4). Cut a 2-inch-long section of putty from its roll, using a knife.
- 5). Knead the putty with your fingers until its inner core blends with its outer core. The two parts of the putty have different colors. Blending the putty fully gives the putty a uniform color. The two parts of the putty react with each other.
- 6). Press a small amount of the blended putty into the leak's hole.
- 7). Wrap the remaining putty around the cleaned area of the copper pipe, forming at least a 1/8-inch-thick, 1-inch-wide layer of putty all the way around the pipe. Press the putty against the copper pipe's surface and into the putty you pressed into the leak in Step 6.
- 8). Wait the putty manufacturer's recommended cure time, usually 15 minutes, before turning on the water.
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