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.

Petrol Spills reproduces the blue-black shade of great intensity observed in heavy oils and lubricants, on barrels in a truck bed and the round marks left by barrels on the ground, and left by the flamethrowers and combat vehicles.