Weathering for Realism
One of my many interests is model railroading with a switching layout that I am building from a design I developed and is on display in my home.
To make this layout come together, amongst other things it involved building the buildings depicting the various industries that populate the layout, and once they were built, they needed to be painted.
Once they were painted, to add realism to the buildings, I then weathered them with the use of weathering powders. These powders are intended to make rolling stock, buildings, vehicles, and detailed models look old, dirty, rusty, faded, and generally worse for wear after being exposed to the elements of weather, travel, pollution, and mechanical wear and tear.
The powders that I use can be blended together to get new colors. Depending on what I'm weathering, I'll select the proper sized brush to apply the powders. Once I'm satisfied with the weathering effects, I then use an air-brush to spray flat acrylic crystal clear over the surfaces that were weathered to permanently lock the powders in place.
There's probably not a square inch on the entire layout that hasn't been weathered, including the complete yard, ballast, track, buildings, all rail cars including locomotives, yard lights, vehicles, and workers, well everything that is part of the layout.
This tire factory in the photo can be seen as part of the layout here.....