Water
I have not yet heard of an IPAS routine which would accomplish what you're
looking to do, but I'll keep my eyes open. I think we just used that 2-sided
"jellow like" material and ,with the 3-d scale tool, filled in the container.
It did not matter if it protruded over the sides because it was hidden by the
base plane…. well, it worked for us, but good luck! Nick