If I have already painted on the base layer ( possibly by mistake!) is there a way to put this painting onto a new layer? Thanks
It is possible but only with a bit of messing around.
Unwrap UVs on the object. Unfortunately this may take some time if you’re over 300k poly resolution.
Once unwrapped, go to bake the texture - can change what you want to bake in the 
settings icon. Bake from itself.
In object layers, there is now a backup layer of the vertex paint 
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Many thanks. In this case I think I’ll just repaint, but it’s useful to know for the future (I’m forever forgetting which layer I’m on !)
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