Everywhere there is a rock face, an outcropping of rocks or a road cut, there is rock debris of various sizes and shades. Talus is a lightweight material used for modeling rock debris. Just sprinkle on some Talus and secure with a 50/50 mixture of Scenic Glue and water. Intermix grades and blend shades for the most realism. Modify Talus colors with Earth Colors Liquid Pigments, if desired. 25 cu. in.