If any of you guys do castings- say of figure heads, accesories, equipment,etc, you can keep a mould or two handy and push any leftover milliput into the mould. Sabves wasting it and as long as you push it in firmly you will get outstanding results. Even if you don't fill a simple mould completely you can put it aside for next time you have left over milliput to top it off.
I often cast heads, particularly of out of production resin figures I've bought, so that I can replace the usually poorer quality plastic figure heads.