If you buy a 'touch-up kit' from your stealership, they will give you two bottles of touch-up paint if your car is lacquered. One will be the correct MB paint for the base coat, and the other will be a clear lacquer. Just give them your paint code, or chassis/VIN number if you are not sure.
HTH,
Cheers,
Will
P.S, not wanting to alarm you, but peeling lacquer near a roof gutter could indicate that this area of the body has been re-finished. Just FYI?!?