Painting interior door panel problem
Got some "new" door panels from the junkyard, but they are tan, and my interior is gray. So I got some Colorbond dark graphite paint to match them to my truck. Cleaned the hell out of them with soap and water, degreased them, then went over them with a tack cloth. Sprayed Duplicolor Adhesion Promotor, then the Colorbond.
I'm having a real issue getting the Colorbond to bond to the panels. On top of that, after a few coats, it leaves like a gray dust on the panels that I can wipe with my finger.
Do I need to scuff them up with sandpaper to help adhesion? On all the things I looked up on this subject, everyone just said to clean them well and use adhesion promotor. Never anything about sanding the plastic.