Casein is the protein of milk.
It is used to fix fillers on walls.
Consequently, caséine is a glue but can be used as a fludifiant agent in mortars and lime painting which facilitate their application.
Ref : CAS
Casein is the milk protein.
This natural powdered binder is used as a fixative for whitewashes, plasters and paints for wall supports.
Casein is therefore a glue but can also be used as a thinning agent in lime mortars and paints, facilitating their application.