That playfield looks pretty sweet Daniel

Theres nothing i hate more that trying to touch up one small patch in a large area of one colour. So what i've taken to doing is to repaint the whole area in a close matching colour... masking off the surrounding areas and spraying in the new colour.
Having said that, i think you've done a pretty good job with that yellow. I usually give up after several attempts at colour matching and just paint the whole lot 

Once again, well done!!