The Complete Guide to Repainting a Shipping Container

Whether your shipping container’s paint job is looking a little shabby or you’re planning to buy a second-hand unit and give it a new lease of life, repainting a container can make a big difference. Not only will it improve the appearance (especially if it’s being used as a workshop, office or garden room), but it’ll also help protect the steel against rust, UV and the great British weather.

The good news? You don’t need to be Michelangelo to do a decent job. With the right tools, some patience and good old-fashioned know-how, repainting a container is manageable for most DIYers. In this guide, we’ll walk you through everything you need to know, from prepping the surface and choosing the right paint to understanding RAL colours and deciding when it might be worth calling in the professionals.

Why Repaint a Shipping Container?

Shipping containers are built to be tough, but after years of exposure to salty air, heavy handling and changing weather conditions, even the hardiest units can start to show their age. However, repainting isn’t just about giving your container a facelift — it’s an important step in protecting the steel and ensuring it lasts for years to come.

Here are some of the most common reasons to repaint a container:

• Protect from Rust & Corrosion: Even one-trip shipping containers (which are usually as close as you can get to ‘new’) can pick up chips and scratches that expose the metal underneath. Repainting helps create a fresh protective barrier.
• Aesthetics: If your container will be seen regularly, whether it’s on your driveway, a job site or being converted into a home office, a clean coat of paint can make as much of a difference to the container as it can to the surroundings.
• Cover Blemishes: Many second-hand containers come with cosmetic damages, such as scuffs, scratches, graffiti, and faded branding. A good respray can make an unloved container look smart and polished.
• Matching Colours: Want to match your garden, business branding or planning requirements? You can choose from a wide range of RAL colours, including popular greens, blues and greys.
• Increase Value: If you’re planning to sell your container, repainting it can boost its appeal and perceived value.

Prepping Your Container for Paint

Before you crack open the paint tin, it’s important to prepare the surface properly. Skipping this step, or rushing it, can lead to poor adhesion, uneven coverage and a paint job that flakes or peels far sooner than it should. A bit of time and elbow grease here can make all the difference later on.

Check for Lead-Based Paint

If your container is more than 20 years old or you’re unsure of its history, there’s a chance the original paint may contain lead. While it’s unlikely you’ll find lead in newer units, lead-based paints were often used on older models for their durability and rust resistance.

Before you start scraping, sanding or blasting, it’s worth doing a simple lead test — available from most DIY shops (such as B&Q) — to make sure that it’s safe to carry on.

If the results come back positive, avoid dry scraping or sanding the surface yourself, as this can release dangerous dust. In these cases, it’s best to call in a professional with the proper equipment and safety gear.

Pro Tip: Lead poisoning is serious and can be fatal. It’s also preventable, so skipping this step isn’t worth the risk.

Clean the Exterior

If you found no signs of lead on your container, then the next step is to remove all traces of dirt, dust, grease and other surface contaminants. Pressure washing is one of the quickest, easiest and most effective ways to clean a container, but if that’s not an option, a stiff brush and a degreasing solution will do the job.

Be sure to pay special attention to the roof and corners, where grime tends to build up. Let the container dry completely before moving on.

Remove Rust & Flaky Paint

Next, check for rust spots, bubbling paint or any areas where the original coating has begun to lift. Use a wire brush, scraper or sander to remove any loose paint and surface rust. For more stubborn areas, a rust converter can help stabilise the metal before painting.

If the container is heavily rusted or the old paint is in poor condition across large areas, sandblasting can be a more efficient option. It strips the surface back to bare metal and provides a clean, even base, though it usually requires specialist equipment or professional help.

Don’t worry if the container doesn’t look pretty at this point. A solid base is much more important than a flawless finish.

Repair Any Damage

Now’s the time to deal with dents, scratches and leaky seals. Minor damage can usually be patched up with filler or sealant, while holes and warped panels may need welding or replacing.

If you’re not sure what to look for, our guide to checking the condition of a shipping container is a good place to start.

Apply a Suitable Primer

Before painting, apply a coat of anti-corrosive primer designed for use on steel. This helps the paint adhere properly and adds an extra layer of protection against the elements. Most primers need at least a few hours to cure, so check the product instructions and plan ahead.

Choosing the Right Container Paint

Once your container is prepped and primed, it’s time for the fun part: picking your paint. But before you dive into the colour charts, it’s important to make sure you’re choosing the right type of paint for the job.

What Kind of Paint Do You Use on Shipping Containers?

Shipping containers are made of corten steel, which needs paint that can handle exposure to wind, rain, UV rays and fluctuating temperatures. Standard emulsion paints won’t cut it, you’ll need something durable, weather-resistant and designed for metal surfaces.

Most people opt for one of the following:

• Acrylic or Alkyd Enamel: These oil-based paints are commonly used for steel structures and provide a hard-wearing finish. You can also buy them online, from trade suppliers such as PremiumPaints and Everest.
• Marine-Grade Paint: Designed to withstand harsh coastal conditions, it offers extra protection for containers stored outdoors.
• Bitumen-Based Paint: Often used on container roofs, this thick, tar-like coating provides excellent waterproofing. While it’s typically only available in black, it can be found at general DIY shops like B&Q.

Whatever you choose, make sure it’s compatible with your primer and suitable for exterior use on metal.

Pro Tip: Many metal paints contain volatile organic compounds (VOCs), chemicals that can give off strong fumes as the paint dries. If your container will be used as a workspace or living area, it’s worth choosing a low-VOC or VOC-free paint to reduce health risks and improve air quality inside the unit.

Understanding RAL Colour Codes

The RAL colour chart is a universal colour-matching system used across Europe. It’s particularly useful when repainting a shipping container, as most commercial paints for steel are matched to these codes.

Some of the most popular choices for container paint include:

• RAL 5010 – Gentian Blue
• RAL 6005 – Moss Green
• RAL 7016 – Anthracite Grey
• RAL 7004 – Signal Grey
• RAL 9005 – Jet Black
• RAL 8008 – Olive Brown

You’ll find hundreds of options in the full RAL colour chart. Whether you want something bold, subtle or practical, there’s a shade to suit.

Pro Tip: If you’re trying to match existing paint, look for signs of the original RAL colour code printed on the container’s metal identification plate.

How to Paint a Shipping Container

You’ve prepped your container, chosen your colour and found the right paint for the job, now it’s time to get painting. If you’re doing it yourself, then following the steps below will give you a longer-lasting, better-looking finish.

What You’ll Need

Depending on your setup, you might choose to use brushes, rollers or a spray system. Here’s what most people use:

• Rollers & Brushes: Ideal for small areas or touch-ups. Use a short-nap roller for smoother coverage.
• Airless Paint Sprayer: Speeds up the job and gives a more even coat, especially useful for full resprays.
• Protective Equipment: Gloves, goggles, overalls and a good mask (especially if you’re spraying or using a high-VOC paint).
• Dust Sheets & Masking Tape: To protect areas you might not want to paint, like the identification plate or the rubber seals on the door.

If you’re painting outdoors, remember to check the weather forecast and avoid painting in direct sunlight, high humidity or on very cold days, as this can affect how the paint dries and how well it sticks to the steel surface of your container.

How much paint will you need?

Paint coverage depends on the type of paint, the condition of the container and your method of application. For example, spraying generally uses more paint than rolling due to overspray and thinner layers. If your container is heavily rusted or you’re using a lighter colour over a darker base, you may need a few extra coats.

That said, here’s a rough guide to help you plan ahead:

• A 20ft container typically needs between 20–40 litres of paint for two coats.
• A 40ft container may need anywhere from 40–80 litres of paint for two coats.

Don’t forget to factor in a similar amount of primer. If you’re planning to spray your paint, you may need to add thinners.

Step-by-Step Container Painting Process

1. Apply Primer: If you haven’t already applied a primer, do so. Then make sure it’s dry and evenly applied before painting.
2. Start with the Roof: This avoids dripping on freshly painted sides.
3. Paint in Sections: Use long, even strokes, whether you’re rolling or spraying and work from top to bottom to catch any drips.
4. Let it Dry: Drying times vary depending on the paint and weather, but it’s usually best to wait 4–8 hours between coats.
5. Apply a Second Coat: For best results, most paints will need at least two coats, though some high-performance paints may recommend a third.
6. Finish with a Topcoat: This step isn’t always needed, but some people add a protective clear coat for added UV and moisture protection.

Once everything is dry, give the container a final once-over to check for missed spots, patchiness or uneven texture.

Should You Hire a Professional for a Shipping Container Respray?

Repainting a container isn’t rocket science, but it is a big job. If you’ve got the time, tools and patience, a DIY approach can be satisfying and cost-effective. However, there are some instances where calling in the professionals might be the better option.

When a DIY Job Might Be Enough

If your container is in good condition, the surface is easy to prep, and you’re only after a basic single-colour finish, a DIY approach is perfectly doable. It’s a great way to save money — and with a bit of care, the end result can look just as good.

When to Consider a Professional Respray

Hiring a professional might make sense if:

• The container is badly rusted or damaged.
• The paint you need to remove is lead-based.
• You don’t have the time, tools or space to do it yourself.
• You need a specialist finish (e.g. multi-colour branding or anti-graffiti coating).

A professional respray also comes with the added benefit of expert prep work, meaning better adhesion and longer-lasting protection.

How Much Does a Shipping Container Respray Cost in the UK?

The cost of a professional container respray depends on several factors, including the size of the container, its condition, the type of paint you choose and how much surface prep is needed. Additional extras, like custom branding, anti-graffiti coatings and a specialist finish, can also affect the final price.

Most providers will include cleaning, priming and painting in their quote, but it’s always worth double-checking exactly what’s included in the cost.

FAQs

How much does it cost to get a shipping container painted?

The cost of a professional respray depends on several factors, including the size of the container, its condition, the type of paint used and the amount of surface preparation needed. To get an accurate quote, it’s best to contact a local supplier or container specialist with details of your container and any specific colour or finish you’re after.

How do you finish the outside of a shipping container?

After prepping and painting the container, you can finish it with a clear protective topcoat, especially if you want added UV resistance or a glossier finish. While not always essential, a topcoat can help extend the lifespan of your paint job and reduce fading over time.

What kind of paint do you use on shipping containers?

You’ll need a weather-resistant, exterior-grade metal paint. Acrylic or alkyd enamel paints are common choices, while marine-grade paints offer extra durability for containers stored outdoors. Always use a compatible anti-corrosive primer first. For colour matching, many people choose from the RAL colour chart, which includes popular shades like RAL 6005 (green), RAL 5010 (blue) and RAL 7016 (grey).

How do you prep a container for paint?

Surface preparation is key to a good finish. Start by thoroughly cleaning the container to remove dirt, grease and grime. Then, remove any loose paint and surface rust. Check for lead-based paint on older containers, and make any necessary repairs before applying a suitable metal primer.

How much paint does it take to paint a 40-foot shipping container?

It depends on the condition of the container and your application method, but for two coats of paint, the amount of paint you need could be anywhere between 40 and 80 litres. If you’re spraying, factor in extra for overspray and thinner layers. Don’t forget you’ll also need a similar amount of primer.