How to Seal Leaky Drain Pipes

Shut off the water source running to the pipe before attempting to fix a leak. This will stop the leak while you are applying your materials and prevent water from limiting the effectiveness of some adhesives.

Locate the area of the pipe that has the leak. Remember that water can travel along the outside of the pipe before dripping off; be sure to trace the water back to its source to properly seal the leak.

Dry the area near the leak with a towel and apply a few layers of electrician's tape. Wrap the tape about six inches in either direction from the leak to ensure it is sealed properly. This fix is temporary, and will only work on small leaks, such as pinholes. The tape is not waterproof and will not prevent a leak from spreading.

Apply plumber's epoxy to the leaky area; this is especially effective if the leak is near the joint of the pipe. Some epoxy comes in two colors; take an equal size piece of each and knead them together until it becomes a uniform color. Push the epoxy into place using your fingers or a putty knife. The epoxy will form a waterproof seal around the area and so is a more effective plug for a larger leak or for one at a fitting. Read all instructions on the product for proper drying time; be sure the epoxy is completely dry before allowing water to run through the pipe.

Apply an automotive hose clamp and a piece of hose rubber or sheet cork -- this option is one of the most effective solutions for a leak. Hold the piece of rubber or cork over the leak and attach the clamp to hold it in place. These materials are readily available at most automotive retail stores.