Changing color of cloth headliner

I would vacuum it with a brush attachment to clean it up a bit.
That is a good idea. I hadn't thought of that. Be gentle.
I'm all for painting interior parts it saves $$$ I picked up a nice blue door card set and sprayed it black for my Dart works fine I know the blue dart guys may be upset but the seller said no one was biting at the time.
Nothing at all wrong with the special plastic and cloth paint. SEM is the best I have ever used. On vinyl and plastic, I always use an adhesion promoter and a few light coats of SEM clear coat (gloss or satin) to protect the parts. One can get excellent results.