Unfortunately, Graphene is insoluble in water making it unsuitable for use in paint-like situations.
However, I discovered that TiO2’s photocatalytic properties can reduce Graphene Oxide to normal Graphene - in ambient light conditions. This allows the coating to ‘cement’ itself to surfaces after being applied.
Graphene Oxide is soluble in water as the introduced oxygen molecules induce hydrogen bonding - hence why Graphene Oxide is used often as a precursor to Graphene.