Repairing a sagging car headliner is a common DIY project that can save you hundreds of dollars. The most effective and permanent method is to remove the fabric, clean the old foam backing from both the board and the fabric, and re-adhere it using a high-strength spray adhesive specifically designed for headliners. While simpler fixes like using pins or stickers exist, they are temporary and can look unprofessional. A full re-adhesion restores the factory appearance.
The key to a successful repair is using the right materials. High-temperature headliner adhesive is crucial because regular spray glue can fail in the heat of a car, causing the fabric to sag again. You'll also need a stiff-bristled brush or plastic scraper to remove the old foam, and a helper can make handling the large, fragile headliner board much easier.
Here are some common spray adhesives rated for this task:
| Adhesive Brand & Type | Key Feature | Estimated Dry Time | Best For |
|---|
| 3M Super 77 Multipurpose | Fast-tack, general purpose | 15-30 minutes | Smaller areas, mild climates |
| 3M Headliner Adhesive (90) | High-temperature resistance | 30-60 minutes | Hot climates, permanent fix |
| Loctite High Performance Spray Adhesive | Clear-drying, strong bond | 60 minutes | Avoiding bleed-through on light fabric |
| DAP Weldwood Landau Top Adhesive | Professional-grade, waterproof | 24 hours (full cure) | Maximum durability, convertibles |
The process involves carefully removing trim pieces, sun visors, and dome lights to free the headliner board from the roof. Once out of the car, lay it on a clean, flat surface. Thoroughly scrub away all the disintegrated foam from the board and the back of the fabric. Apply a light, even coat of adhesive to both surfaces, wait for it to become tacky (as directed on the can), and then carefully press the fabric onto the board, working from the center outwards to avoid wrinkles. After reinstalling the board, let the adhesive cure fully with the windows cracked to ventilate fumes.
