Vallejo Weathering Effects 200ml - Industrial Thick MudVallejo Acrylic 200ml Industrial Thick Mud. The innovative range of Weathering Effects offers the modeler a new medium for depicting the effects of exposure to weather and extreme climates on vehicles and armor. The placement of our model in a diorama or vignette gives it a reality, a background and a history, an added dimension and a reason for the humidity, the traces of mud, of the dry sand of the desert or the dark earth of the wooded landscapes