Hi
Is there a way to animate Materials in the timeline when my object has already been assigned a Material (Color - Fill - Material)? I know it can be done when no Material has been assigned.
If not is there a way can I remove the Material?
Any help would be great as I can not find anything in the Documentation and I am trying to set up Material render passes in ZBrush
Chris
EDIT
A-Ha! 
I have found a way to do this if you load a material (not selecting it from the menu) this will overwrite it and I can animate different materials now.
This should be useful for adding flat colour, cavities or reflection maps.