If your headliner is sagging or has fallen off, you might be tempted to reattach it with glue or another fastener like staples, tacks, or push-pins. Unfortunately these will only provide a temporary solution and you’ll eventually have another loose and sagging headliner. Our mechanic Andy’s tips and instructions in this article and video describe how to do your own headliner repair correctly, which includes removing the headliner and the old fabric and foam, and installing new fabric.