Step 1
Turn off the supply of water to the leaking PVC pipe by turning the supply valve clockwise.
Step 2
Squeeze equal parts of the two-part underwater glue onto the piece of cardboard and thoroughly mix the underwater glue with the putty knife. The underwater glue needs to have a uniform color appearance to ensure that glue is mixed correctly.
Step 3
Load the putty knife with enough mixed underwater glue to cover an area at least twice the size of the PVC pipe leak. If you are repairing a pinhole leak, you should use enough glue to cover an area the size of a quarter.
Step 4
Apply the underwater glue to the PVC pipe with the putty knife, making sure you have thickly covered the repair area of the leaking PVC pipe.
Step 5
Allow the two-part underwater glue to cure for 24-hours before you turn on the water to the repaired PVC pipe.