A saggy roof lining is an unsightly problems that can occur to the interior of a car. Repairing the sagging lining is a simple project that takes just a few hours and tools to restore to an almost factory-new appearance.
Open all doors to the car. You don't want to be trapped inside the car with the strong scent of contact cement glue. You'll end up with a terrible headache if you don't have proper ventilation.
Inspect the roof liner. Check for any holes or if the liner is just sagging. Repair any holes before adjusting the liner. Double-thread the needle and knot the ends together. Pull the liner down enough so you can reach the hole from the inside. Turn the edges of the hole inside the hole and sew a seam on the underside of the liner, hiding the seam on the underside of the liner.
Work in small sections. Start from the back of the car. Pull the liner tight against the roof. Pour some contact cement inside a small container. Dip the brush into the glue and paint it onto the roof. Press the roof liner against the glue until it sticks. Use the clamps to hold the liner in place as it dries.
Work your way slowly to the other end of the car, always working in small sections at a time. When you reach the edges of the car, trim off any excess liner with the razor. Allow the glue to dry for 24 hours. Throw away the container and brush.
Inspect the car the next day to see if you need to add any additional glue to make the liner stay in place. You can paint on any additional glue or use the glue directly from the bottle.
Be careful not to get the glue on your fingers. Contact cement dries quickly and can easily fuse your fingers together for several minutes before you'll be able to break the glue bond.