[fastball]

But is that not why he is using a fluid? A fluid does not have intermolecular bonds that need to overcome the centripetal force, so it shouldn't be a problem?

[taneq]

It still has inertia, and as you point out it has the added disadvantage of having no internal structure to help hold it in place.

Put a plate in the center of a turntable and pour some water into it. Now rotate the turntable, slowly accelerating. What happens to the water?