Headlining May 09, 2020, 01:13:37 PM Thanks to eddypeck.The headlining (or roof-lining) is a one piece molded section with a cloth layer, fixed in place with central clips and tucks under the side/door/window/sunroof rubbers and A/B/C pillar trims. It is made from a thin compressed 'foam' polystyrene type material which the best and most accurate description I've ever heard is it being the stuff cheesy quavers are made out of.The material covering is a sponge 'skrim foam' backed cloth, in either dark grey or light creme with a mottled pattern depending on trim.Dark for GTI along with Black A/B/C pillars. Light with creme trim for all others.Configurations of the headlining are specific to cars with or without a sunroof and 3 or 5 doors. Jetta and Jetta Coupe are also independent of each other.None are interchangeable.The foam backed material is glued to the 'quaver' base.Imagine the layers:- Car roof- Quaver board- Glue layer- Skrim foam- Cloth trimOver the years due to hot and cold changing environments the skrim foam starts to disintegrate to dust so the cloth trim layer falls away as there is nothing for it to grip to.People often try to glue the cloth back to the board but this is unsuccessful due to the fact you are not gluing to a clean solid surface.The only way for successful repair is to strip the old material, including the defunct foam dust and old glue to get to the (less than) solid quaver. And spray glue (High Temp Upholstery Adhesive - Trimfix) new replacement material.https://www.amazon.co.uk/Trim-Fix-500ml-Temperature-Adhesive-Lining/dp/B01L03CJGI/ref=asc_df_B01L03CJGI/?tag=googshopuk-21&linkCode=df0&hvadid=309947856166&hvpos=1o1&hvnetw=g&hvrand=9479363035845316861&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9045571&hvtargid=pla-699722923646&psc=12 cans should be enough.VW Heritage (Heritage Parts Centre) have reproduced the dark GTI trim, but it is a single layer cloth and not foam backed like the original. The pattern is spot on, but the foam back of the originally material creates a soft touch and smooths out small imperfections. It is the best reproduction material for OEM look available. https://www.vwheritage.com/191867501-headliner-material-kit-vw-spareOther options would be generic aftermarket foam backed cloth to your choice - the disadvantage here would be the need to also retrim sunroof panel, handle surround piece and sun visors.