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.

Painting metal panels necessitates unique techniques compared to most surfaces. Here is a potential list of supplies you will need to paint metal:Painting Metal Panels

Pressure washer
 Paint sprayer
 Safety gear
 Oil-free liquid soap
 Masking tape
 Metal-paint or latex-bonding primer
 Metal paint
 Acrylic latex paint
 Paint roller
 Roller extension
 Plastic sheeting
 Paint tray
 Trisodium phosphate
 Rust converter

How to Use Acrylic Paint on Metal

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 Priming a Metal Buildingthe 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.

5 Important Steps Preparing Metal For Paint

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.