Repairing a sagging or detached headliner requires a more involved process, which may include:
* Identifying the Problem: Is the adhesive failing? Are there broken clips or staples? Is the foam board itself damaged?
* Preparation: You'll likely need to remove the headliner completely to access the problem areas. This involves carefully removing any trim pieces, sun visors, dome lights, and other components attached to it.
* Repairing the Framework: If the framework is damaged, it needs to be repaired first. This might involve reattaching loose components or replacing broken pieces.
* Re-attaching the Headliner: Once the framework is sound, the headliner can be reattached. This often involves using a spray adhesive specifically designed for headliners (applying it to both the headliner and the framework), carefully pressing it into place, and using clips or staples to secure it further.
* Reinstalling Components: After the adhesive has dried, carefully reinstall the trim pieces, sun visors, dome lights, etc.
Important Note: This is a relatively complex job. If you're not comfortable with automotive interior work, it's best to take your car to an upholstery shop or an auto detailing specialist. They have the experience and tools to do a professional job and ensure a lasting repair. Trying to glue it back in place without proper preparation and materials will likely lead to a poor-quality repair that will soon fail.
