thanks I'll try itthe reason why the car is glossy because the specocc and materials file the car using.
in default, green specocc for Merc + the materials results a gloss effect. which is suitable for grey color. if you apply a clear and black color for mercedes without altering the specocc and materials the color will look glitchy.
i suggest if you want to apply white color for Merc, change the specocc to purple, and use a material file from Lotus, Sauber, Willams etc.