I wonder what a rubbing a little Varathene into the crack would do. Might mess up the surface, and tends to have a yellow tint, but maybe it could be machine or Dremel tool buffed to where it didn't show as badly as the crack. Maybe someone knows the source for the plastic coating used by MB?

__________________
John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E