Membrane Walls (Zero Thickness Walls)

[asf_arq]

Revit should include a "Membrane Wall" system family, similar to the existing "Basic Ceiling" family. This would be a better alternative to the Paint tool for managing paint jobs and alike, as it would support phasing, floor plan tagging, and other features that the Paint tool currently lacks.

[Simon_Weel]

That's not a real solution to the problem of Materials. See / vote for this topic: Materials and Finishes are not the same - Autodesk Community