A Comprehensive Metal Roof Coating Guide for Homeowners

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Posted: 6th September 2019

Though metal roof coating is extremely common these days, many homeowners have several questions about painting their metal roofs. The process of metal roof painting can be broken down to three simple steps. The first step involves determination of the substrate you are planning to paint. This may include the roof metal as well as any existing paint. The next step is determination of the best available products and methods for preparation of the existing surface. In the third step, you need to choose an appropriate coating system for the job.

This brief guide will help you protect your roof and avoid expensive metal roof repairs.

Determine the Substrate: Roofing applications make use of different types of metals including steel, copper, stainless steel, aluminum, etc. Out of these metals, copper is most easy to identify because of its color and shine. As far as steel is concerned, the easiest identification process is to make use of a magnet. Galvanized steel or Terne tin tends to get attracted by a magnet. On the other hand, stainless steel is not attracted by magnets. Aluminum has recently emerged as a popular choice because it is light weight, resistant to corrosion, and can quickly dissipate heat.  It’s easy to spot Aluminum because it mostly comes with a factory finish.

After determining the type of metal, it is now time to find out if there is any existing coating. Oil-based roof paints are the most traditional products used for roof coating. In the recent years, however, acrylic paints have also emerged as a popular choice. These two coating types can be identified by rubbing a spot with a rag soaked with denatured alcohol. Acrylic products will melt in presence of alcohol, but oil paints will remain unaffected. Elastomeric and asphalt coatings are used occasionally, and can be identified by their distinctive appearances.

Surface Preparation: As far as coating is concerned, the most appropriate surface is a bare metal. However, it is important to deal with unfavorable surface conditions such as rust and corrosion. Unfortunately, it is difficult to find a bare roof without any previous coating on its surface. Mechanical methods such a sanding, scarping, wire-brushing, etc. can be used to remove existing oil coatings and acrylic products. However, roofs with asphalt products are extremely difficult to prepare for a fresh quote.

Choosing the Coating System: Finally, it is time for you to choose a metal roof coating system, based on the available surface and your intended application.

You should use an oil-based system when you have a rusty surface made of a ferrous metal or there is a previously existing oiled product coating. Acrylic paints can be used on any surface that doesn’t respond well to oil products, such as Terne and galvanized products, aluminum, etc. These paints can also be used for painting over an existing old asphalt coating. Specialized products such as elastomerics can be used to benefit from the heat reflecting properties of these materials.


We had our roof restoration and roof painting done by Prestige Roof Transformations and we decided to go with dulux products for two reasons: the product is very safe (for our tank water) so we can drink clean water straight off our roof and also for the insulation benefits as it reflect the heat which lowers our energy costs. We are more than happy with the work Prestige Roof Transformations did. Excellent job!

John and Linda Carr – Tinbeerwah Sunshine Coast

We are really pleased with the way the roof turned out because it has been nearly 30 years and our roof was bearing a lot of patches. We have a two storey home and the upstairs was really hot before Prestige Roof Transformation restored our roof. We are very happy about the advice of Prestige Roof Transformations especially about the cool roof system. The new cool roof system came up really well and now we are looking forward for cooler time and environment upstairs. Also, we have a steep roof and Prestige Roof Transformations was really careful about the safety of the men working on the roof which really impressed me. We are so happy about the job they have done!

Julie McKenzie Bli Bli – Sunshine Coast

Highly recommended. Brad assured me that they would start the job once receiving my acceptance of the proposed Commercial Painting works. I was very impressed as they finished the painting before the 3 weeks promised. Everyone on the job was courteous and considerate…… professionalism at its best. Nothing was a problem and I would not hesitate to recommend them to my family or friends.

Olga – Nicklin Way

I’d like to compliment your guys firstly for the quality of their workmanship and in addition the professional manner they have undertaken their work. They moved through the various areas unobtrusively and were very respectful of the privacy of the occupants. It was a pleasure dealing with them throughout the project. My congratulations to both you and your team for encouraging such professionalism.

Sid Ryan – Alexandra Heads

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    Prestige Home Transformations provide exceptional standards of craftsmanship and professionalism throughout our roofing services such as roof restorationsroof repairsroof cleaningroof coating & roof painting. Our high quality service is also carried through into our commercial painting services, residential painting services & body corporate maintenance. We are available across Noosa, Caloundra, The Sunshine Coast & Surrounds listed.

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