Reasons for Headliner Detachment:
* Adhesive Failure: The original adhesive has aged and lost its bonding power. This is the most common cause.
* Sagging: The headliner fabric may have stretched or sagged over time, causing it to pull away from the board.
* Water Damage: Water damage can weaken the adhesive and cause the headliner to separate. This is a serious problem as mold and mildew can be present.
* Loose Clips/Bow: In some cases, the headliner may be held in place by clips, which may have broken. There might also be a supporting bow that is broken or improperly attached.
Gluing it back on (Pros and Cons):
Pros: Cheaper than professional reupholstering or replacing the entire headliner.
Cons:
* Difficult Access: Working inside a car's headliner is tight and awkward.
* Messy Job: Adhesive can be messy and difficult to clean up.
* Potential for Failure: The glued area might not hold long-term, especially if the fabric is stretched or the board is damaged.
* Uneven Appearance: Achieving a perfect, seamless bond is challenging, and the repair may be visible.
* Risk of Damage: You could accidentally damage the headliner fabric or the interior trim while working.
If you decide to attempt gluing it:
1. Assess the Damage: Carefully examine the area where the headliner is detached. Identify the cause of the separation and the extent of the damage. If there's significant sagging or water damage, gluing alone won't likely solve the problem.
2. Clean the Surfaces: Thoroughly clean both the headliner board and the fabric where they come in contact. Use a suitable cleaner, perhaps a degreaser, and allow them to dry completely.
3. Choose the Right Adhesive: Use a spray adhesive specifically designed for headliners and fabrics. Avoid using something too strong, as it can damage the fabric. Read the instructions carefully.
4. Apply the Adhesive: Follow the adhesive manufacturer's instructions precisely. Usually, this involves spraying a thin, even coat on both surfaces.
5. Re-attach the Headliner: Carefully align the headliner and press it firmly against the board. Work slowly and methodically, ensuring good contact across the entire surface. Use a roller or smooth cloth to press out any air bubbles.
6. Support the Headliner: Once the adhesive is set (follow the adhesive's drying time), you may need to support the headliner with additional clips or supports to prevent it from sagging again.
Consider Alternatives:
If the damage is significant or you're uncomfortable with the job, it's best to consider these alternatives:
* Professional Upholstery: A professional auto upholstery shop can repair or replace the headliner effectively.
* Replacement Headliner: You can purchase replacement headliners online or at auto parts stores. Installing a new headliner is a more involved process but results in a better outcome.
In short, gluing the headliner back on is *possible* but challenging. Weigh the pros and cons carefully, and if you're unsure, consult a professional. A poorly done job will likely lead to a more significant problem down the road.
