Humbrol Weathering Powders are a versatile means of adding realistic weathering effects to your models, figures and dioramas. hey can be mixed to create different shades, enabling a full range of finishes from dust to mud, soot, rust and many more. Usage: Used to create realistic weathered effects. Substrate: Weathering Powder can be applied to most substrates depending on the method. Application: Weathering Powder can be applied dry or mixed with several Humbrol products. Try dusting the powders on, using capillary action or in a paste with acrylic paints or weathering washes. To fix the weathering powder we recommend Humbrol Mattcote varnish or Decalfix - our experts find both create different effects depending on the situation you want to create. Drying Time: Dependent of application methods. How to Clean: Dependent of application methods.