Originally Posted by 
4X4V8
				
			 
			That 3M 77 is rated to 65 degrees C, which I imagine would be fine for an automotive interior. It is a clear spray though, right? I don't trust a thin, clear glue for headliner anymore after my experience. When I do my headliner again I'm going to find a thicker high-temp 3M glue. I'm hoping that I only have to use it for some edges that start to come away on regular intervals, but I can see I'll be doing the whole job again one day.
When I bought the material (from an automotive trimmer) they were spraying a headliner board to glue new material. It was a really thick gooey mess coming out of the spray gun (they do so many that obviously they use an air spray gun rather than aerosol cans) compared to the thin aerosol stuff I used. I still managed to use two cans of it, so I wasn't going lightly. 
By the way, your trimming work is looking good so far! With the contact glue you shouldn't need to clamp down the material but it doesn't hurt to do it. I've noticed that my later P38 doesn't have the flocked material on pillar trims but is vinyl painted an off-white/cream colour.