I am quite familiar with Blender (V2.81) and now I am starting to experiment with procedural material, made in the material node editor.
Now, I know that I can assign different materials to single faces of my object. So a cube, up to 6 different materials (one for each surface).
But, is there any way to reuse that procedural material to paint on an object? I really would like to use different procedural materials to blend together without using Image Textures (pixel graphics).