Domestic headliners are all together different. Unlike import headliners that turn gooey and messy behind the decorative material. Domestic headliners de-laminate from there foam backing typically where the sun hits them over the front or rear windshield. This creates a labor intensive preparation process of having to remove the foam prior to recovering the board with new material. If new material is glued over the old foam it will be affect the fitment of the headliner being to thick and will give a swollen appearance where the headliner comes in contact with components such as trim moldings, sun visors, lights, pillar posts etc. The material will not be smooth and will not last glued over deteriorating foam.