These additives are used to change the viscosity or appearance of leather paints. Angelus 2-Hard and 2-Soft allow standard Angelus paints to be used on plastic and fabric parts of sneakers and shoes, while Angelus Duller will reduce the sheen of Angelus paints. Angelus 2-Thin is mixed with Angelus paint so that it can be used with an airbrush or spray gun.