How do you get wrinkles out of an auto vinyl headliner?

To remove wrinkles from an auto vinyl headliner, start by carefully heating the area with a hairdryer on a low setting or using a heat gun at a safe distance to avoid damaging the material. Once the vinyl is warm, gently stretch and smooth out the wrinkles with your hands or a soft cloth. If necessary, you can also use a small amount of spray adhesive to help secure the vinyl in place. Allow it to cool and set before reassembling any parts of the vehicle.