Any leaking PVC pipe joint needs to either be cut out and replaced, or if that isn't possible, it needs to be resealed. If the pipes are so loose they can be pulled apart, PVC pipe cement can be used to join the pipes together. But if the pipes are leaking but still fused together, your only option is to attempt to make a temporary seal by using any commercially made rubber adhesive type product.
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Things you need
- Rubberised adhesive
- Heat gun
- Isopropyl alcohol
Dry the joint to be resealed using a heat gun on low setting. The area must be completely dry.
Rough up the area with sandpaper. Nothing fancy here, just sand in and around the area to be sealed, which will give the rubber adhesive a good place to hold onto.
Dip a rag in isopropyl (rubbing) alcohol, and wipe down the area to be sealed. This will clean up any sanding residue as well as dirt and debris in the area.
Squeeze some rubberised adhesive into the joint of the pipe, and work it in. Many of these products come with applicator sticks, so use that and force it into the pipe joint that needs to be resealed.
Coat the entire area with adhesive, and be liberal about its use. Overlap the area to be sealed by at least 1/4-inch, goop it on thick and let it set.
Allow the adhesive at least eight hours to cure before running water into the pipe. If possible, wait 24 hours before running water, as these products fully cure within that time.
Tips and warnings
- Although this is considered a temporary seal, depending upon how thoroughly it is done, it may last for days, weeks, years or the life of your pipe.
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