Hi Jim - I used UPOL Plastx No.4 coarse texture coat on my dashboard and interior panels. There is a definite technique to applying it, you have to be far enough away from the subject that the paint part-cures before it hits. Warm weather helps. Because the surface finish can be quite rough when fully cured I went over the texture with wet and dry sandpaper (used wet) and then finished with UPOL satin black.

Plastx No.4 fine texture works well on smaller items, like the steering column shroud.

Or you could apply a more traditional fabric headlining?

Good luck with whatever you choose to do.