Can You Paint Galvanized Steel? Don’t Overlook These 3 Steps

You’re already aware of the benefits of galvanized steel’s corrosion resistance, thanks to a protective layer of zinc. This is the key to projects that can last for decades in the harshest conditions. But what if you need a certain color for aesthetics, DOT requirements, or company branding? Can you paint galvanized steel?

The short answer is yes, you can paint galvanized steel. However, failure to follow the proper steps will leave your project in peril as it falls victim to non-adhering and cracking paint.

The bottom line? You need to follow the recommendations of your paint supplier and manufacturer.

However, we’ve outlined some general, important points that you should consider when you speak to your paint supplier and manufacturer.

Can You Paint Galvanized Steel? Don’t Overlook These Three Steps

Galvanized steel gets its strength from a zinc coating that has been applied through a process called galvanization. This both prevents corrosion and increases longevity. 

However, this zinc coating can also make adhesion challenging due to its smooth and non-porous surface.

When considering whether or not to paint over galvanized steel, you must consider the important steps that will ensure your success; you don’t want your paint to crack or fail to attach to the galvanized surface. 

Here is some general information on ‘Can you paint galvanized steel’ with this basic preparation guide. Any specifics should be addressed directly with the painter and/or manufacturer. 

How Do You Prepare Galvanized Metal for Painting?

Can you paint galvanized steel? Absolutely—but your success hinges on the following steps:

1. Cleaning the Surface

Before painting, all dirt, contaminants, or oil must be removed to ensure the surface is properly prepared. Some recommend using alkaline or acidic solutions and solvent cleaning to remove any organic materials. If the metal has small detailing, be sure to clean every crook and corner.

2. Rinsing and Drying

You want to be sure there are no cleaning residues on the surface before you apply the paint. Use clean water and be sure the surface dries completely. Don’t overlook this step; it’s crucial for a successful project. 

In certain cases, you may want to etch the surface. Etching aids the process by roughening the zinc coating, and as a result, creating a more compatible surface for the paint. 

Apply the etching solution by following the manufacturer’s instructions, and be sure that the surface is dry before progressing to the next step.

3. Applying Primer and Paint

Be sure to use a metal primer that is created specifically for use on galvanized surfaces. This helps the paint to seamlessly and effectively attach to galvanized surfaces. This is where we recommend working with your painter–they will have the insight into the project that can help you streamline your project to success. 

After the primer has dried, use the recommended, specified type of paint and apply it in even coats. Again, it’s important to follow the manufacturer’s instructions to be sure you have a strong seal. Make sure each coat dries completely before adding another one. 

Can You Paint Galvanized Steel? Take Advantage of Our Tips and Best Practices

We’ve already reviewed the importance of cleaning and priming before painting, but we’ve also got a few other tidbits of advice that will assist you in your project.

• Apply many thin coats of paint. This will give you a more durable finish.
• Be sure to allow each layer to dry thoroughly before applying another.
• Use the correct, high-quality brushes or spray equipment suitable for the kind of paint you use.
• Safety first! Be sure to have proper ventilation, as well as gloves and a respirator. 
• ALWAYS follow the guidelines of your paint supplier or manufacturer.

What Type of Paint Will Stick to Galvanized Metal?

You probably already realize that you can’t just use any type of paint to cover galvanized metal. The paint has to be specifically formulated for galvanized surfaces. An example of this type of paint is an oil-based, direct-to-metal paint, sometimes referred to as DTM paint. If you don’t want to use an oil-based paint, acrylic latex will also work, provided it has been prepared correctly. 

Again, your paint supplier will have the crucial details about what type of paint you should use. 

What Type of Paint Works Best on Galvanized Surfaces?

As we mentioned earlier, DTM or acrylic latex will likely be your best choices, because they not only adhere to galvanized metal, but they are also incredibly durable. 

Can You Paint Straight Over Galvanized Steel?

You can, but without following the steps outlined above, the paint will peel and will not adhere to the surface for long periods. It’s best to take the extra steps and do the job right the first time when painting galvanized steel.

This is why we always recommend following the guidelines of your paint supplier and manufacturer.

For Galvanized Steel that Stands the Test of Time, South Atlantic Has You Covered

Make sure your endeavors withstand the test of time through our leading galvanized steel and hot-dip galvanizing services. This robust defense against rust and corrosion has long been the right choice for longstanding projects. 

Contact us today so we can provide steel that will fortify your construction, and see why now, more than ever, South Atlantic has you covered.