Federal job category 4100 includes trades focused on applying finishes and coverings to surfaces across federal buildings, equipment, and infrastructure. These roles involve painting, paperhanging, and surface preparation using brushes, rollers, spray guns, and other tools. Employees in this category work with a variety of materials—such as paint, varnish, lacquer, epoxy, and wallpaper—to protect surfaces and enhance appearance. Tasks may include sanding, filling cracks, mixing coatings, and applying decorative or protective finishes to wood, metal, concrete, and synthetic surfaces.

Most positions fall under the Federal Wage System and are hands-on, often located at military installations, federal facilities, or public service buildings. Workers must follow safety protocols, especially when handling hazardous materials or working in confined spaces. Whether restoring historic interiors or maintaining exterior surfaces exposed to the elements, GS-4100 roles require craftsmanship, attention to detail, and knowledge of surface treatment techniques. These jobs help preserve the functionality and visual integrity of federal assets.