a workflow utility for Substance Designer
Substance Designer Capping Utility
It functions just like your normal blend but has a second output to show you when you exceed the 0-1 space. This can be changed in colour to suit and used as an overlay or as a mask (use a grayscale conversion to use this to help blend back the capping area). Also on Artstation Here
Available:
Artstation
Gumroad
Flipped Normals