Michem Guard 25 Polyethylene Michelman Scratch/ Srcub/ Mar resistance agent Coatings >> Waterborne Nonionic polyethylene dispersion. Michem® Guard 25 is a water based polyethylene dispersion which promotes mar resistance and flatting properties and can be used in paint and coating formulations. Nonionic polyethylene dispersion. Used in paint and coating formulations. Provides mar and flatting properties.