The answer to 'my leak repair smells bad' is that a foul odor after a leak repair is often caused by bacteria or mold growth in the affected area. This can happen if the leak was not properly cleaned and dried before the repair was made.
Common causes of a smelly leak repair include lingering moisture, trapped debris, or improper disinfection. The symptoms may include a musty, rotten, or sewage-like smell. To solve this, you'll need to thoroughly clean and dry the area, then disinfect it to kill any bacteria or mold. If the smell persists, it's best to call in a professional plumber to properly diagnose and address the issue.