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I know that Grey Knights and Minotaurs are both paintes in metallic paints, but does anyone know of any other metallic Marines?
Also, how would one (spoiler, me) go about painting say silver, gold or bronze armour?

For metallic marines, you have the Doom eagles and Silver Skulls (both silver Ultramarine successors). The Iron Snakes and the ones you mentioned. I'm sure there are more. Maybe someone else can recall. Also you have the successor chapters that are listed as an 'unknown' colour scheme, so there is some scope. As for the how to paint, there are many tutorials online about painting metallics that will be better explained than most peoples one paragraph answer. For example . It is a Necron tutorial but covers both silver and gold. its not too complex yet yields good results imho. Good luck.

Blood angels command are often gold.

Sororitas, while not astartes, are also often gold