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Can You Paint a Metal Roof? Preparation and Coatings

Yes, you can absolutely paint a metal roof. Whether you have standing seam, corrugated, or ribbed metal panels, a fresh coat of specialized paint will not only completely transform your property’s appearance but also act as a crucial protective barrier against the elements. 

However, making the decision requires a clear path: are you painting to mitigate surface rust, enhance curb appeal, or extend the lifespan of an aging roof?

According to roofing material experts, applying standard exterior paint directly over a metal roof will lead to peeling and flaking within a single season. Success requires direct-to-metal (DTM) acrylics or elastomeric coatings, proper rust mitigation, and precise weather conditions.

If you’ve recently bought and installed your metal roof, it may be cost-effective to wait six months before purchasing metal roof paint. The six-month waiting period allows you to enjoy the metal roof’s original color while allowing weather elements to act on it and weather the factory-applied oils. 

At the end of the six months, the original paint may have begun fading and the surface will be lightly etched, thus making your job and primer adhesion easier.

Benefits of Painting your Metal Roof

Many property owners are not aware they can paint their metal roofs. Moreover, they do not know the many benefits of painting a metal roof. If you’re one of them, here are some benefits to know:

Tools Needed To Paint a Metal Roof

Painting your metal roof is no child’s play. You must be willing to work at a height and have the requisite safety gear to prevent accidents or damage to your roof. As part of your preparation for the job, here are some of the most important tools needed to paint your metal roof.

  • Rust-inhibitive galvanized metal primer: This compound encourages paint adherence to the metal roof’s surface, thus reducing rust.
  • Premium DTM (Direct-to-Metal) acrylic latex Topcoat in the desired color: Topcoat is applied in the desired color to improve the roof’s appearance and shine.
  • Wire brush or wire wheel: Used to remove old paint and flaking rust from the metal roof surface and promote new paint adherence.
  • Power washer: Cleans dirt, dust, mold, and debris from the metal roof’s surface. Use a TSP (Trisodium Phosphate) cleaning solution for best results. 
  • Paint brushes, rollers, etc.: Used for applying paint to the metal roof.
  • Paint spray (Airless paint sprayer): Used for spraying paint on the metal roof for a factory-smooth finish.
  • Ladders or scaffolding: Used to reach the metal roof.

All the items above are essential for painting your metal roof. However, you should hire a professional painter or schedule a free roof safety inspection if you aren’t good with heights. If you must DIY this project, you should also strictly observe all safety protocols.

Now that you have all the tools needed to complete the job, you can start planning the next step to paint your metal roofing. As part of your plan, here are some recommendations;

  • Don’t paint alone: Grabbing a buddy when attempting a task like this is always advisable. Your buddy can help you steady the ladder as you climb up or down. Having a buddy on the job can also reduce fatigue and encourage you to get the job done faster.
  • Work from the ladder: A good safety practice is to work from your ladder as much as possible. Your ladder can support your weight when in good condition, but your roof may not. Your ladder is the best option, especially when spray painting your metal roof. If, however, you need to use paint brushes or rollers, contact a professional.
  • Wear a harness with safety ropes: Make sure you have an OSHA-approved roof harness with safety ropes if you need to DIY using rollers or paint brushes. The safety rope secures you from falling, especially when you miss your footing or slip off the roof.

Preparing Your Metal Roof

  • Remove old paint: The first step is to remove the old paint. Please be advised that you should never add a fresh coat of paint to peeling or blistering old paint. Instead, use your wire brush, wire wheel, or a putty knife to remove the old paint down to the bare metal where necessary.
  • Wash your roof: Wash your roof using a power washer and a TSP degreaseonce the old paint has been removed. This washing ensures you don’t paint over dust, debris, and mildew, other particles that will cause your new paint to bubble. Allow the roof to dry off and drain properly before taking further action.
  • Apply the paint: Once your roof is properly drained and bone dry, begin spray painting or apply paint using a brush and rollers.

How to Paint Your Metal Roof

Painting your metal roof can be tricky. However, you stand a better chance when you do it correctly. Here are the recommended steps to follow:

  • Choose a nice day with nice weather: Choose a warm, dry day to paint your metal roof. Avoid days with high temperatures as you may get exhausted easily from working under the sun, and the paint may flash-dry too quickly, causing lap marks.  Your best bet should be during spring or early fall when temperatures are consistently between 50°F and 85°F.
  • Apply your primer: Begin painting by first applying the galvanized metal paint primer directly to the metal roof’s bare surface. The primer bonds with the metal roof and creates a canvas upon which you can add your top coat.  Once applied, take a rest while you allow the primer to dry off. You can return to your roof after about an hour or two, depending on the manufacturer’s instructions.
  • Apply topcoat paint: Apply the topcoat paint once your primer has completely dried. Ensure that an even tone is maintained throughout the application. Choose a favorable direction, left to right or top to bottom, and stick to it until the painting is complete. Apply two coats for maximum longevity.

Mistakes to Avoid

While metal roof painting is recommended and beneficial, doing it the wrong way can cost you some money in the nearest future. Here are some mistakes to avoid:

    • Not using  polyurethane roof  sealants on exposed fasteners and seams prior to painting.
    • Not choosing energy-efficient topcoat paint.
    • Using leftover interior or standard exterior wood paint.
    • Not estimating enough materials for the project.
    • Overestimating the materials needed for the project.

Wegner Roofing and Solar offers all types of roofing solutions, including expert metal roof installations and repair services. Trust our roofing professionals to work closely with you to ensure a successful roofing project. 

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