Orblivion wrote:It's not just a matter of respect, Astartes armor has a machine spirit. The reason the Deathwatch leave one pauldron in their chapter's colors is so they don't anger the armor's spirit. So while adding another chapter's icon as a mark of honor is perfectly acceptable, the armor would rebel at being completely repainted in another chapter's colors.
That's certainly within the realm of possibility in a universe where technology is treated more or less like a religion. I recall seeing something on that in an old
WD or something, maybe the original Space Hulk game box? There was a suit of Blood Angels Terminator armor that somehow had ended up on almost-permanent loan to the Ultramarines, but the spirit of the armor was both old and cranky. As long as the suit was red all went smooth, but if you painted it blue the wearer would invariably die in the next engagement. It had happened enough times that the Ultramarines just kept the suit red for now.