There are many 'patches' including the tape mentioned, epoxy, etc. Some people even try to glob more pvc cement over it. The fact is that PVC joints are not really 'glued', they are solvent 'welded'. The primer and glue soften the PVC and when dry 'weld' the PVC together. You should never try to apply new primer or PVC cement to the outside of a pipe. Epoxy or the tape *can* stop some leaks, but at best you should consider it a temporary fix, especially for pressurized systems. The only real fix is to cut out the leaking joint and put a new one in.