I saw vinyl spray paint at autozone and was thinking about painting my dash and trim. has anybody used this stuff? is it any good?

I've used vinyl dye, which is probably what you saw, on hard plastic and ti worked well. However, I haven't used it on the softer dash plastics. People on here have used SEM products:
Plastic Adhesion Promoter
(Optional: Texture Coating)
Color paint

to paint plastic dash pieces and have had good results.

I've used the stuff a few times, on my old Bonne to paint the grill and engine cover, and then on my Wrangler to paint the trim around the headlights and then to repaint my faded fender flares.

Worked very well for me, but I've never used it on a dash or dash trim, I agree on the adhesion promoter

where can i get some of that SEM stuff your talkin about?