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I made the mistake of buying the cheaper spray adhesive from Screwfix. All appeared fine until a few days later. Because of the hot weather we've been having lately in the UK, the headlining adhesive became unstuck! Result, sagging headliner. I had to remove the headliner which ended up useless so I had to buy some more material. I then used Fast Fix which is for high temperatures.
Buy cheap and end up paying more. I'll never learn.