John, it comes that way in the package. It's well done and convincing, though some will flake off during construction.
Bryan is correct. The barn line we developed with Archistories includes roofs patina'd with real rust. Each roof is different between each other. We also had the boards 'weathered' for texture. The advertising is actually airbrushed on the panel. These aren't your ordinary kits!
Saturday update for my T-Trak-Z module build. I have set a goal to have it completed in the next week. Depending how much time I have in the next few days, it could be sooner. Today was all about base color. Note the abandoned siding. This is going to be a fun feature. Time to let everything dry really well overnight. Then it is on to soil and ballast!
Always been a fan of abandoned lines. Honestly it’s one of the more common features you see. I think it just adds to the touch of realism.