It can be done, with very careful prep. The surfaces need to be spotless and grease/silicone free.
I washed and scrubbed with purple green, and then water and Dawn soap. Then I carefully and light wet sanded the surface very lightly with dawn and water with 1000 grit. Then I painted with vynil specific paint
Ive done it black over red, and black over green (kick panels, door panels, pillar covers)
How was it?: Depends what part was painted: Any place where you scuff or constantly place a body part, like a center console lid or top of inner door panel, it will eventually wear thru and you will see the original color
I have never dyed a plastic part, so i cant help there
