Is it possible to either:

1. select multiple layers that contain shape tweened flat colour shapes (with outlines) and apply a gradient to all with one click?

2. apply a mask that creates a global gradient to all the aforementioned layers?

Some more detail on the project:
Its a multilayered, shape tweening animation that I want to give a 3d effect by applying a gradient to each layer....the problem is i need the fastest way to do it as there isnt just one animation...there is about 70 of the blighters..

unfortunatley the animations do not share a common library - or this would be the obvious place to start experimenting IMO.

Cheers
Rossy