guide to removing scratches on aluminium

Aluminium is prized for its impressive strength-to-weight ratio, corrosion resistance, and versatility. Unfortunately, there's one area where it doesn't shine as brightly: scratch resistance.

Aluminium is a softer metal than something like steel, so it can scratch more easily from sharp or abrasive contact. But don't worry - restoring its sleek appearance is easier than you might think.

At Clickmetal, we've spent years working with aluminium in all its forms, and we know exactly how to bring out the best out of it. Follow our step-by-step guide below to remove scratches and bring your aluminium back to its former glory!

Before You Start...

Before jumping right into the repair process, it's worth taking a few steps to prepare. A bit of upfront effort can make all the difference in choosing the right method and achieving the best results.

1. Assess the Damage

Start by taking a good look at the scratch to see how deep it is. Light, superficial scratches might just be surface marks that can be polished out with minimal effort. These usually come from everyday wear and tear, like brushing against another object or light scuffing. Deeper scratches, on the other hand, can cut into the aluminium and may require more involved techniques, like sanding or applying a new coating.

A simple way to check the depth is to gently run your fingernail across the scratch. If your nail catches, it's a sign the scratch is deeper and will need more thorough attention to fix.

2. Gather Your Materials

Next, gather all the supplies you'll need to have on hand:

  • Microfiber cloths
  • Mild detergent or an aluminium cleaner
  • Aluminium polish or a non-abrasive metal polish
  • Water
  • Fine-grit sandpaper (800-1200 grit is ideal) for deeper scratches
  • Clear coat or touch-up paint for deeper scratches on anodised or painted aluminium

3. Clean the Surface

It's always best to clean the aluminium surface before tackling the scratches. This step removes any dirt, grease, or debris that could interfere with the repair process or make the scratches worse.

  1. Start by mixing a small amount of mild detergent with warm water in a bucket or bowl. Steer clear of harsh cleaners or abrasive chemicals, as these could damage the aluminium's finish.
  2. Next, dip a microfiber cloth into the soapy water and gently wipe down the surface. Pay extra attention to areas around the scratch, focusing on removing dirt, grease, and debris.
  3. Once the surface is clean, rinse it thoroughly with clean water to remove any leftover soap.
  4. Use a clean, dry microfiber cloth to completely dry the aluminium. This step prevents water spots and gives you a clear view of the scratches you're about to fix.

removing scratches on aluminium

How to Remove Light and Deep Scratches

Now you're ready to start the repair process! The best method will depend on how deep the scratch is and whether the surface is painted or anodised. Check out the sections below to find the right approach for your specific situation.

Light Scratches

Light, surface-level scratches are fairly easy to fix and don't need any heavy tools. Here's what to do:

  1. Start by applying a small amount of aluminium polish to a clean microfiber cloth. A little goes a long way, so don't overdo it.
  2. Next, use the cloth to gently buff the scratched area in a circular motion. Keep the pressure light and consistent to avoid creating uneven spots or overworking the area.
  3. Once you've finished buffing, use a clean part of the microfiber cloth to wipe away any excess polish. This prevents residue buildup and gives you a clear view of your progress.
  4. Inspect the scratched area. If the mark is still visible, repeat the process. It might take a few passes to fully remove the scratch, so be patient and take your time for the best results.

Deeper Scratches

If the scratch is deeper, you'll need to take a slightly more involved approach using fine-grit sandpaper. Here's how to do it:

  1. Start by wetting the sandpaper with water. Wet sanding helps reduce friction, prevent heat buildup, and avoid creating more scratches. Make sure both the sandpaper and the aluminium surface stay damp while you work.
  2. Gently sand the scratched area, moving the sandpaper along the grain of the aluminium. Avoid sanding in circular motions, as this can create swirl marks that may be difficult to remove. Use light, even pressure to smooth out the scratch without overdoing it.
  3. After sanding, wipe the area clean with a damp microfiber cloth and check your progress. If the scratch is still noticeable, switch to a finer-grit sandpaper (like 1200-1500 grit) and repeat the process. Using progressively finer grits will help create a smoother finish and get the surface ready for polishing.
  4. Once the scratch is minimised or removed, apply some aluminium polish to a clean microfiber cloth. Gently buff the sanded area in small circular motions to restore the aluminium's shine and blend the repaired spot with the rest of the surface.
  5. Finish by wiping away any excess polish with a dry microfiber cloth to reveal the final result. If you're looking for an even shinier finish, you can repeat the polishing step until you're satisfied.

Scratches on Anodised or Painted Aluminium

Fixing scratches on anodised or painted aluminium can be more challenging than working with bare metal, but it's more than doable with the right steps. Here's what to do:

  1. Start by gently sanding the scratched area with sandpaper, moving along the grain or following the surface's natural contours. The aim here isn't to completely remove the scratch, but to smooth out rough edges and create an even surface for the touch-up. Be careful not to sand beyond the scratched area, as this could damage the surrounding finish.
  2. After sanding, wipe the area down with a damp microfiber cloth to remove any dust or debris. Make sure the surface is dry and free of residue before moving on to the next step.
  3. Choose a touch-up paint or clear coat that matches the original finish of your aluminium surface. If it's painted, pick a colour that blends in smoothly with the rest of the area. If it's anodised, a clear coat is typically the best choice to bring back its protective layer.
  4. When applying the paint or clear coat, use thin, even layers to avoid buildup. Let each layer dry fully before adding another, if needed. Take your time and follow the manufacturer's instructions for drying times to get the best results.
  5. Once the touch-up is completely dry, check the finish. If you notice any inconsistencies or edges, you can lightly polish the area with a non-abrasive polish to help it blend better with the surrounding surface. Take your time and use a gentle touch to avoid damaging the fresh layer.
  6. If you want a totally seamless look, you might want to polish the entire surface. This evens out any differences in sheen and makes the repaired area less noticeable. Use a soft microfiber cloth and a suitable polish for the surface, working in small circular motions to create a uniform finish.

How to Prevent Future Scratches

While it's impossible to completely prevent scratches, there are some simple steps you can take to minimise the chances and keep your aluminium surfaces looking their best. Here's what you can do:

1. Apply Protective Coatings

Protective coatings create a barrier that helps shield aluminium surfaces from everyday wear and tear. Here are some of the best options to consider:

  • Anodising: This process forms a tough oxide layer on the aluminium, offering excellent scratch resistance and boosting durability.
  • Powder Coating: By applying a dry powder and curing it, you get a strong, scratch-resistant finish. It also allows for a wide range of colours and textures.
  • Paint: Painting aluminium with durable, high-quality paint can add a layer of protection against scratches while also letting you customise its appearance.

2. Avoid Abrasive Cleaning Tools or Harsh Chemicals

When cleaning aluminium, avoid using abrasive tools like steel wool or stiff brushes, as these can scratch the surface. Instead, stick to soft microfiber cloths or sponges that are gentle on the finish. Harsh chemicals can also damage or dull the aluminium, so opt for mild, aluminium-safe cleaners in their place.

3. Handle Aluminium Items with Care

Be mindful when handling aluminium objects, especially things like kitchenware, furniture, or industrial components that see a lot of use. Scratches can easily happen from accidental bumps, drops, or rough handling. If you need to move aluminium pieces, using padding or protective wraps is a simple way to reduce the risk of damage.

4. Use Mats, Pads, or Covers

Protect aluminium countertops and furniture by using protective mats, pads, or covers. These will shield your surfaces from scratches caused by sharp objects, heavy items, and daily use.

By following these simple tips, you can reduce the likelihood of scratches and keep your aluminium surfaces in top condition for years to come.

Level Up Your Aluminium Projects with Clickmetal

Planning on working with aluminium soon? Choosing high-quality materials is key to getting the best results - and that's where Clickmetal can help.

We have a wide range of premium aluminium components to choose from, including sheets, angles, plates, channels, and more. Everything can be custom cut to your exact dimensions and comes in a variety of thicknesses to suit your needs. We also offer a range of finishing services (including anodising, painting, and powder coating) to help protect your aluminium and keep it looking great for years to come.

Ready to start your next project? Explore our range and find the perfect aluminium pieces to bring your ideas to life!