Spent some time on the net lookin for different techniques and build threads...saw people painting tail lights with shapries. Took the sharpies I had at home, tried, nothing. Barely leaves any color on the plastic and can be wiped off with a finger.
Then I tried this - a piece of red paper (cardboard, from some pencil box) behind the clear plastic. It looks flat, but I think it could work if I made the paper mask according to the actual tail lights (amber where amber needs to be, clear and red).
Im thinking about getting another scale car to build under this one