Check out SAETTA from the italian forum he wrote somewhere that he sanded down both the mudguard and the screen with the finest sandpaper and then applied many many layers of matt black paint and if you see the pictures in the gallery under his name you will see the result is excellent, but he stress the importance of giving many light coats of paint never allowing it to drip or bubble so, light sprays and from a good distance. let it dry then repeat until satisfactory.