The Vallejo Weathering Effects range, have been formulated with permanent pigments and water-based acrylic resins, have been developed to represent the effects of time and weather on models and dioramas.

The effects of humidity create textures of greenish mould and slime even on areas exposed to the sun. The lighter shade of Grime is perfect combined with Slimy Grime Dark to recreate streaking from light to dark.