...is there a way to get that flat black colour on the front mudguard and wind screen, like on the picture attached ? I just don't like that original glossy finish on my xtx.

the probelm is not getting the matt paint on ,it will be trying to keep the paint on the mudguard,the problem is getting a good key for the paint to adhear to it,being plastic you cant really sand it down and get a good finish,you might try getting it lightly sand blasted (and i mean lightly) the matt black paint you should be able to buy in any automotive shop.

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.

Thanks guys, I'll check with him first and probably try it on the mudguard, cause its already well scratched from the front and left side