Last plastic painting question, I hope

A bit late to say this but... You should not have sanded plastic, especially the areas that get chrome. Chrome reflections amplify the slightest imperfections. When I repair and/or modify plastics I must sand the welds, sand to reshape, etc.., so I use the finger nail buffing blocks sold at dollar tree to rub the surfaces back OEM smooth. These small strips of various material will peel off the foam block as needed. A lot of rubbing.