This is a video of how we fix the headliners on the Volkswagens that the factory glue pulls away from the main liner, we use a staple gun with quarter inch staples. This happens a lot in the 2006 to 2010 Volkswagen. The older Volkswagens 2005 and under have a very thin headliner and you can use headliner adhesive glue for them, very lightly. Do not try gluing these at all. Staple gun is needed.