I created this shader to dynamically add more variation to my scenes
without baking it into the main textures. This is incredibly handy
especially on trim sheet style mapping, though it can be used on
anything. You can create many styles of your model quickly and easily
(Clean vs Dirty)
This shader utilizes RGB Texture channels to defines masks. You can
control the colour, gloss and intensity of each channel. The mask is
based off the models 2nd UV channel.
Let me know how it goes, and if there are any issues!
Quick video of it in action