We began with the intention of creating the lotus on the left hand page and using the right one as our palette to develop into a separate painting. Effy began with watercolours so first thing I had to do was cover my left hand book paper in my recycled art journal with watercolour ground. The Ground means the watercolour paint doesn't soak into my page but as you can see the colours haven't flowed as they would on watercolour paper, plus you can see the brush marks of spreading the ground (wasn't noticable when first laid down the colour which also dries lighter). It's okay for a base layer.
Once dry you must always spray with workable fixative so the watercolour won't move with the next layers of media. Love what develops after...the right hand side is using up leftover paint and ink.