One advantage of a metal building is not having to regularly repaint it as opposed to other siding materials. However, at some point, the owner may way to change the color for one reason or another.
In addition, the paint may become faded by the sun or damaged and rusted, requiring repairs. While metal building panels can be coated in any color by the manufacturer, you can always paint the metal as needed.
Pressure washerPaint sprayerSafety gearOil-free liquid soapMasking tapeMetal-paint or latex-bonding primerMetal paintAcrylic latex paintPaint rollerRoller extensionPlastic sheetingScissorsPaint trayTrisodium phosphateRust converter
Getting paint to adhere to metal requires a decent amount of prep work. As mentioned, flaking and peeling paint due to patches of rust or metal corrosion requires the use of wire brushes along with sanding and scraping.
To properly clean the surface, start with 80-grit sandpaper to remove as much of the rust as possible followed by 120-grit sandpaper to smooth out the surface. Roughing up the metal will improve the adherence of the paint.
A wire brush attached to a drill will remove the worst of the peeling paint and rust. For really stubborn areas, you may need to use a sandblaster.
This video shows the restoration of a badly damaged metal building:
Some metal surfaces also require cleaning to remove dust and grease by using mineral spirits. For persistent dirt, you may need to wash the area with a mild detergent.
If there are dents or holes in the surface, you need to repair those as well. After sanding the area, apply an epoxy-based mixture to each spot.
The next key is a rust-inhibitive primer. Here is a post that explains this further:
Priming is a very important step in preparing metal for paint, especially if the surface will be exposed to moisture. To select the right primer, the type of metal to be coated along with the desired appearance, performance requirements, and environmental conditions should be considered. To begin with, water-based (latex) primers shouldn’t be used on metal surfaces, as moisture can seep through and cause paint to fail within weeks or months. Professionals recommend two types of metal primers: the rust converters mentioned above and galvanized metal primers. While a rust converter is ideal for preventing rust from recurring and making a rusted surface easier to paint, a galvanized primer is appropriate for metals (e.g. aluminum) that prevent paint from adhering to the surface. You can also find iron oxide and zinc chromate primers, which can be used on most metal surfaces, including interior and exterior iron and steel.
Stainless steel surfaces don’t necessarily need to be primed because they already have components that prevent oxidation. Choosing a type of metal that doesn’t require priming will definitely save you time and money.
Don’t forget to contact a Denver painting contractor if you don’t have time to do the job yourself. They will have the knowledge and materials to do the job without a hitch.