The reason that headliners sag on the car is because the foam between the headliner material and the glued portion of the material erodes with time causing the main portion of the headliner to sag. The only repair is to replace the headliner material by removing the headliner, pulling the old material off, cleaning the fiberglass headliner and gluing new material on. Your local upholstery shop can re-do your headliner for approximately $150.00.
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