Painting dash a couple general questions

I just redid mine. Took me 4x to get it right. LOL long story.

You can just hit with a scotchbrite pad(the brown one) and repaint. Primer is only needed if you are down to the metal. Clean good with prep sol cleaner or you could use some dish soap and water and then dry. For the back I would hit it with some OSPHO(phosphoric acid) and it would be fine. I stripped mine down to the metal and sprayed with some Dupont Emron I had around.