Covering Material Application
You need to understand the basic concepts about covering materials application.
An experience material appears only once in the tree, under the Materials node. However, you can apply the material to several actors.
Each material application has a set of properties that define how the material is applied.
If you insert a product and then expose all its materials, the material applied to the highest actor in the hierarchy takes priority.
If you create and apply a material, the newest material takes priority over existing applied materials.