This is a fully procedural Substance Designer material that I've made to revisit an old project (An old spaceship made out of junk).
I will make all its materials using substance. Everything is procedural so I can vary how it looks and randomize variations to cover the entire spaceship. The idea is to use for some of it's parts.
There's a second procedural material blended with it that affects only the seams and adds welding points over some edges. :)