Wh20 blues were a real bitch to match, especially the light blue on the mini PF.  I ended up getting several different shades of blues and toning down with white until I got close, took me many tries before I got it spot on, then once I layed down the mylar over it the colour changed slightly    luckly it was not in a obvious area (ball drop)
My PF was very average and I had to do a lot of touchups, check out my resto here:

http://aussiepinball.com/index.php?topic=1404.0

Hope it helps