I did mine using the Ames rattle can that is supposed to match the PUI interior. I have a Legendary interior, so the picture's telling me it's not a perfect match, but the naked eye is much kinder.
I did the dash (originally green) and the speaker kick panels (originally black) in this picture. I also did the console and the rear side panels (lower plastic and upper metal parts).
As far as prep went, I used a gray scotchbrite and wiped down with Eastwood PRE prior to shooting with the rattle can. It didn't turn out too bad for a D.D. ...at least it's a lot less noticeable than a green dash!!