Can You Paint Over Powder Coating?

Can you paint over powder coating? It’s a question you may be forgiven for thinking is rather random and irrelevant for sheet metal fabricators. On the contrary, this is a question we are asked quite often, and with good reason. Powder coating is an extremely important part of many of our metal fabrication processes. Knowing how to apply it, take care of it, and potentially update or replace it later down the line is important to maintaining the lasting integrity of your product. 

So, before we answer whether you can you paint over powder coating, let’s quickly highlight what powder coating is.

What is powder coating?

Metal fabrications are typically tough and highly resistant to wear. This makes them ideal for demanding applications and environments. However, metals like steel that are prone to rust and corrosion can deteriorate more quickly if exposed to harsh weather or moisture. And we get plenty of that in the UK!

In these cases, powder coating becomes a crucial part of the fabrication process. It is applied electrostatically and cured under heat, which forms a strong finish that adheres very tightly to the metal. It offers a protective barrier that extends the lifespan of the finished product. Even for metals that are less reactive, powder coating adds a resilient layer that helps guard against water, chemicals and UV damage.

Can you paint over powder coating?

Okay, but can you paint over powder coating? Technically yes, but with specialist preparation and materials. Otherwise, you may struggle getting your paint to bond or stick. This is because the methods used to apply the coating (as mentioned above) make it hard to paint over with standard paints and what you could consider the typical painting process.

Success rests in surface preparation, as well as the right choice of primer and paint. Oil based and acrylic paints may work just fine but we would generally recommend using epoxy based paints for the best quality results.

Steps to paint powder coated metal

Before you get started, you will need:

• Masking tape
• Fine grit sandpaper
• Degreasing solution
• Suitable primer
• Chosen paint
• Paintbrush
• Protective gear (overalls, gloves, face mask)

Clean and prepare the surface

Good preparation makes all the difference when painting over powder coated finishes. Begin by thoroughly cleaning the surface to eliminate any dirt, oil or grime that could interfere with paint adhesion. Use a strong degreaser to break down any residue, then rinse the area well and allow it to dry fully before moving on.

Next, use fine sandpaper (180–220 grit) to lightly roughen the surface. The aim here is not to remove the powder coating but to give it a slightly textured finish that helps the primer stick. Avoid heavy sanding, just enough to dull the gloss. After sanding is done, you can use a solvent cleaner to remove any dust and debris.

Apply the primer

Priming is a crucial stage when painting powder coated metal. You’ll need a specialist primer designed to adhere to slick or non-porous surfaces. This forms a strong base for the top layer of paint. Apply the primer evenly and allow it to dry for at least an hour, or according to the product’s instructions.

Choose and apply the right paint

Once primed and dry, you’re ready to apply your chosen topcoat. Select a paint that suits the environment. For example, there are weather-resistant options for outdoor use. Apply two even coats, letting each coat dry thoroughly before applying the next. For best results, follow the drying times recommended by the paint manufacturer.

Other ways to prevent rust and corrosion on metal

• Pick rust resistant metals: Choose stainless steel, aluminium or titanium.
• Maintenance: Regular cleaning removes corrosive salts, acids and pollutants. It also identifies potential repairs too.
• Environmental control: For valuable metalwork (like classic cars or art), use dehumidifiers, climate control, or silica gel packs to minimise moisture exposure.

• Laser treatment: Advanced laser technology can create a non-crystalline surface, increasing resistance to corrosion.
• Use drying agents: Keep equipment and storage areas free from dampness.

Powder coating services from Salamander Fabrications

Here at Salamander Fabrications, we have a wide variety of paints, finishes and colours available for you to choose from. We utilise GEMA equipment for our powder coating process, which can be carried out manually or with a reciprocating gun/automatic reciprocating gun. We can also utilise a protective two coat system with primer and finishing. Our facilities enable us to accommodate parts up to 3000mm long, 1000mm wide and 1400mm deep.

Contact Salamander Fabrications for more information

We hope we have helped answer the question – can you paint over powder coating? If you would like some more information on our powder coating capabilities or any of our other services, please feel free to contact us any time. The team here at Salamander Fabrications are more than happy to talk through the services we have to offer, including our:

• Laser cutting services
• Welding services
• Metal folding services
• Sheet metal fabrication services
• CAD design services
• Electro mechanical assembly services

Give us a call on 01484 843599 or send an email to sales@salamanderfabs.com.