This video shows you how to paint the Non-Metallic-Metal Gold on the chest of Fulgrim. It talks about the reflections and some of the difficulties with the shape of the piece.
The following paints were used:
Games Workshop: Rhinox Hide, Mournfang Brown, XV-88, Balor Brown, Troll Slayer Orange
Vallejo: Ice Yellow
P3: Morrow White
Kimera Colours: Diarylide Yellow (Fire Dragon Bright alternative)