Some years ago I bought a Le Rapide CIWL restaurant with an wrongly painted gloss black roof.
This did not look good with my other Le Rapide CIWL cars, since these roofs should be off-white. So I changed the roof with the roof of an Le Rapide SNCF car.
But then the SNCF car did not look good and I noticed that LE rapide SNCF cars do have not off-white but white roofs. So that iss how I repainted it:
Regards
Fred