An industrial building has many components—staircases, handrails, door frames, etc.—that may be made of metal. These need to be protected from the damaging effects of mother nature and being used constantly every day. There are specific kinds of paint that can provide these protections for each type of metal. Here are three tips on preparing and painting metal surfaces of an industrial building.
Know the Type of Metal
Metals come in two main categories: ferrous metals, which have iron in them; and nonferrous metals, which don’t contain iron. The easiest way to know if the metal in your building is ferrous or nonferrous is to use a magnet. Magnets will only stick to ferrous materials. This is a major indicator of what type of paint and primer to use.
Understanding the type of metal the building has is extremely important for interior and exterior painting in John’s Creek and surrounding neighborhoods. Ferrous materials, like steel, are more prone to rust and corrosion in hot, humid environments like they have in Georgia. Stainless steel and similar metals form an oxide layer that protects them from rusting. Metals like copper and zinc, however, do not, and will need a coat of paint to provide a barrier.
Galvanized metals are a type of ferrous metal that’s coated with a layer of zinc. Zinc provides amazing corrosion resistance to metals. You’ll need to prepare any surfaces with this type of metal so the paint can properly adhere to them. You can then apply a DTM coating.
Types of Paint
Primers are used before painting to add specific protective qualities to the metal and provides a base for the paint to stick to. The finishing coat adds a layer that prevents moisture from seeping through and gives the metal an appealing aesthetic. DTM (direct-to-metal) coating is a latex-based paint made of 50% primer and 50% topcoat. With DTM paint, industrial painting service professionals can get the job done in one simple step. Being latex-based, DTM coatings do not prevent against rusting, and is therefore best for interior surfaces. Exterior painting surfaces should be coated with oil based paints, aka alkyd enamels, which provide good rust prevention.
Bare Metal Protection
Bare, aka untreated, metals need paints with a rust deterrent. If the (usually ferrous) metal has any rust spots, they must be removed before applying any paint. You can do this by scraping the surface with a brush. Other techniques you can use include sanding, abrasive blasting, and dissolving the rust with an acidic solution. Before putting on the final coating, you should prime the metal with a rust inhibitor. When doing interior or exterior painting in John’s Creek, make sure you understand the type of metal you are working with and use the correct type of primer and topcoat.