A1 Rotation can be used to create a (thin) even layer in a (closed) mould.
A1 Rotation is a 1:2 system and consists of A1 Rotation Liquid (1 part) and A1 Rotation Powder (2 parts), which are poured into a (closed) mould once mixed together. An even layer can then be created in the mould, either by hand or using a rotation machine. Keep rotating until the A1 Rotation has hardened.
You may find that you have to adjust the rotation speed and rotation angle to achieve even coverage in every corner of the mould. The end result may be a little fragile due to the thinner skin.