How to apply two different colors to the same face without splitting the face? I've found that splitting the face works but causes assemblies to break.
Use a decal on that face then with the right colours, maybe?
Joshua Richman - Splitting the face would be the best way to go, or you could try and apply a solid color jpeg to the face, that wouldn't affect the geometry.. You could do a search here on the forum for SSP or Skeleton Sketch Part, using this process you won't have any issues splitting the face as you need to.
Another option that wouldn't cause problems in assemblies would be to make a Cut-Extrude using a sketch that is offset from the true split by a very small amount and to a depth that is very small, less than your typical drawing tolerance. So, you original face is still there, but just a very small area around the edges:
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