Hmm. I don't know about that. But what I do know is that Sintra expanded PVC sheeting has been used in the sign industry as a substrate for vinyl graphics for close to twenty years and that I have never seen vinyl lettering fall off.
Of course, the vinyl graphics use a different adhesive
than contact cement, not sure why it would matter.
The specific intended use for Sintra is to have stuff stuck to it, basically because it is uniform in color, you can cut and drill without having to paint
the edges making it a time saver. You've probably seen it walking down High Street in front of the shops but never knew it.
It's not super stiff, but it is reasonably hard and dense. Usually when it get used in big sizes there is a frame to support it. I think for a curved/arched headliner
it should be fine. Maybe do a test with your intended contact cement but I personally wouldn't worry so much.