The answer to 'leak repair not working' is that there could be several common causes, such as an underlying plumbing issue, incorrect repair methods, or the wrong type of sealant or material used. Symptoms may include ongoing leaks, water damage, or mold growth. Solutions can involve re-evaluating the root cause, using the proper tools and techniques, or calling in a professional plumber.
If a DIY leak repair is not successful, it's often best to call in a licensed plumber to diagnose and fix the problem properly. Plumbers have the expertise and equipment to identify the source of the leak, determine the right repair method, and ensure the issue is resolved completely.