Concerning your answer to the headliner falling down, the problem is not the glue, but the material. The foam deteriorates over time , also sped up by southern heat. the material needs to be replaced and the headliner board needs to be cleaned, all done outside the car after the headliner board is taken out. very few cars need the windshield to be removed.
This is referring to this column:
Well whoever it was that answered that has never replaced a headliner or two. Glue doesn’t stick to powder very well. It’s a fun project though that everyone should do once.