contact cement is used for alot of trim, like headliners ect. you can spray or brush it on lightly,to both surfaces, allow it to try to the touch before sticking it together. be carefull, you dont get a second chance to stick it together. once its stuck in place apply some pressure to the entire area. be very neat with the stuff so you dont have any clean up on surfaces of the door. brush on will be way neater.