How to Paint a Metal Roof



First, the chalk and oxidation need to be scrubbed off.  Abrasive pads that will remove the chalk but will not scratch the paint are included with the kits below.  Once the chalk is removed and the metal roof looks good when it is clean and wet, then 2 coats of primer  are applied to restore the cover any rust spots and provide a good base for the metal paint.  A rust-buster paint can be sprayed on with a paint sprayer or it can be rolled on with a microfiber roller.

Apply Primer

Once you have the primer, apply it according to the manufacturer’s instructions. Allow it to dry completely before applying any paint.

Apply Paint

Apply a premium paint and primer to a galvanized roof with a paintbrush or a roller specifically designed for corrugated metal. If crawling around on a metal roof in the hot sun does not sound like an ideal way to spend an afternoon, rent an airless sprayer to complete the project. Not only does a sprayer do a more thorough job than painting with a brush, it allows you to minimize the amount of time spent on the roof. If you spray, choose a windless day to paint.

Painting a galvanized metal roof can be time consuming, labor intensive, and potentially dangerous if you don’t know what you’re doing.  It’s highly recommended that you at least consult with a professional roofing contractor who is experienced with galvanized metal roofing.