I think it may still work if you don't wait until the last layer has completely cured. The viscosity just has to be high enough to be able to suspend the artifacts.
istjohn
Again, you may want to read tfa
ameliusOP
This sums it up:
"To achieve the effect I want, I need around 20 layers for a regular pocket watch movement. If I were to cast each layer in a transparent container, adding components and epoxy as the previous layer was half-cured, I would be doing nothing else for a solid week."