Concur with the above. Below is another thread on the topic which goes into a bit more detail on the process. I just redid my headliner in Alcantara as well.
https://f80.bimmerpost.com/forums/sh....php?t=1899007
Edit:
jaylazy2020 I just realized you started the above thread - which was my motivation actually. I thought you were done with your headliner. What happened?