Michem Guard 55 Polyethylene Michelman Scratch/ Srcub/ Mar resistance agent Coatings Inks INKS Nonionic polyethylene dispersion. Michem® Guard 55 is a dispersion which provides mar and flatting properties when used as an additive in paint, coating, ink and graphic art formulations. Nonionic polyethylene dispersion. Used in paint, coating and ink formulations. Provides mar and flatting properties.