Well. This is what we have.
I used a lot of medium. 2:1 . I’m hoping that the colours will bleed into each other, and that it will reduce in bulk as it dries.
Gave up on the idea of brushing a texture into it, obviously. Dabbed it with a finger to blend the colours, the main thing being to be mindful of which colour is on which finger. The masking tape was so that I could handle the pieces without getting lava all over the rock.
The paint is thick enough that there is no point touching it again until tomorrow.