How to Repair Carbon Fiber Parts to Mirror Finish?

Carbon fiber is an extremely strong and lightweight material that is used in a variety of applications.

It is made from thin, strong crystalline filaments of carbon that are wound extremely tight. The resulting material is incredibly strong and can be used in various ways.

One of the most common uses for carbon fiber is in the manufacturing of aerospace components. The material is also often used in constructing racing cars and high-performance bicycles.

carbon fiber car mirror cover

It’s also becoming increasingly popular in the production of consumer electronics, as it can be used to create extremely thin and strong cases for devices such as smartphones.

While carbon fiber is strong, beautiful, and highly versatile, it’s not indestructible. Carbon fiber can be damaged by impact, abrasion, and chemical exposure.

When carbon fiber is damaged, it’s essential to repair it promptly to restore its original look and prevent further damage.

Fabrication and Structure of Carbon Fiber

Making carbon fiber is quite fascinating, and it’s this process that gives the material its strength.

Carbon fiber is made from long chains of carbon atoms, which are twisted and stretched into fibers. These fibers are then woven into a fabric, and the fabric is placed in a mold and heated to high temperatures.

The heat causes the fibers to bond, and as the mold cools, the carbon fiber takes on its final form.

So what makes carbon fiber so strong? It’s all in the way the atoms are arranged. The long carbon chains are incredibly strong, and when tightly bonded together, they create a solid material.

A gelcoat is applied on the carbon fiber surface to prevent microbuckling. Microbuckling is a type of buckling that can occur in thin, stiff materials like carbon fiber.

When micro-buckling occurs, the carbon fiber is weakened and can eventually break. By surrounding and supporting the carbon fiber, the gelcoat helps to prevent this type of damage.

Why does Carbon Fiber Needs Polishing?

Carbon fiber is often lauded for its durability. However, the gelcoat used to protect the carbon fiber is not as durable as the carbon fiber itself.

This means it’s possible to scuff or swirl the gelcoat, which can reduce the overall lifespan of the carbon fiber.

While the gelcoat is not the most durable thing on carbon fiber, it’s still possible to extend the lifespan of the carbon fiber by taking care of it.

Regular polishing will help protect the gelcoat and keep the carbon fiber parts looking polished.

How to Make Carbon Fiber Shiny Again?

The three main methods for repairing carbon fiber parts are applying fiber glaze, epoxy resin, or wax. In the following sections, we’ll discuss each of these methods in detail.

Apply carbon fiber glaze

Carbon fiber glaze is a clear coating applied to carbon fiber parts to protect and retouch them. The glaze material helps make the parts easier to clean and maintain.

The glaze also gives the carbon fiber parts a high-gloss finish that will make them look great.

Here are the steps to apply carbon fiber glaze to carbon fiber parts:

1. Tape off any parts you don’t want the carbon fiber glaze to get to

2. Apply the carbon fiber glaze in circular motions using a foam applicator

3. Go over the surface several times to ensure complete coverage

4. Leave the glaze to set in for a few minutes

5. Remove the glaze using a microfiber cloth

6. Examine the carbon fiber surface to ensure that you’ve achieved your desired mirror finish

7. If some parts need retouching, repeat the glaze application steps on those parts

Apply epoxy resin

If you want to add a high-quality finish to your carbon fiber parts, epoxy resin is a great option.

Epoxy resin can provide a protective coating that is both durable and attractive. And when applied correctly, it can give your parts a professional-looking finish.

Epoxy resin should be applied on carbon fiber parts following these steps:

1. Sand the surface of the carbon fiber part to create a smooth finish.

2. Mix the epoxy resin and hardener according to the manufacturer’s instructions.

3. Apply the epoxy mixture to the carbon fiber part using a brush or roller.

4. Allow the epoxy to cure for the recommended time.

5. Sand the surface of the cured epoxy to create a smooth finish.

6. Apply a top coat of clear resin to protect the finish.

7. Enjoy your beautiful, shiny new carbon fiber part!

Apply wax

Wax helps prevent the carbon fiber from oxidizing, a process that degrades the material.

Additionally, wax can fill in small cracks and voids in the carbon fiber, helping to improve the overall strength of the part.

Carbon fiber should be coated with wax in the following manner:

1. Fix a 100 grit sanding paper on a sanding block

2. Sand off the bevels on the top layer of the carbon fiber surface

3. Don’t sand too much that you get to the carbon fibers

4. Clean off all the sanded materials

5. Get your epoxy resin coating

6. Wear hand gloves to protect your skin from the resin

7. Apply the first layer of the epoxy resin to the surface

8. Allow 4-5 hours for the epoxy resin to cure and air dry at room temperature

9. After curing, sand the high points on the surface and apply your second layer

10. Again leave the coating to dry for 4-5 hours before you use the coated surface

11. The final carbon fiber surface should have a mirror finish that is nice and shiny

Tips to Consider when Polishing Carbon Fiber Parts

When it comes to working with carbon fiber, there are a few things you need to keep in mind.

Here are crucial tips to consider when waxing and applying fiber glaze to carbon fiber:

1. Make sure the surface is clean. Any dirt or debris on the surface will affect the final finish.

2. Apply the wax in thin, even coats. You don’t want to glob on the wax, or you’ll end up with a messy finish.

3. Follow the manufacturer’s instructions for cure time. If you don’t let the wax cure properly, it won’t adhere well to the carbon fiber.

4. When applying the fiber glaze, work in small sections. This will help you avoid making any mistakes.

5. Additionally, when applying the fiber glaze, use long, smooth strokes. This will help to avoid creating any bubbles in the coating.

6. Always use a high-quality wax, epoxy resin, and fiber glaze. This will protect your carbon fiber from UV damage and keep it looking shiny.

7. Consider the temperature of the room where you will be working. The epoxy resin cures best at room temperature.

8. Remember to wax, and apply an epoxy resin or fiber glaze to your carbon fiber regularly to keep it looking its best.

Should you apply a Protective Paint Sealant on Carbon Fiber Parts?

Polishing your carbon fiber surfaces is great, but if you don’t take care of it, tiny scratches will develop, leaving the surface looking cloudy.

So how do you prevent this from happening? The best way is to keep your carbon fiber protected by a protective paint sealant.

This will protect it from the elements and those pesky little scratches. A protective sealant can also enhance the surface look of the carbon fiber parts.

Applying a sealant is a fairly simple process, but there are a few things you need to keep in mind to get the best results:

  • First, ensure that the carbon fiber surface you are working on is clean and free of any dirt or debris.
  • Next, apply the sealant evenly and in a thin layer. You don’t want to overload the surface with sealant, as this can cause problems down the road.
  • Finally, let the sealant dry completely before exposing the surface to the elements.

There are many different types of protective paint sealants on the market, and choosing the right one for your carbon fiber parts can be a daunting task.

However, there are 3 main things to keep in mind before making your decision:

  • First, you need to consider the environment in which your carbon fiber parts will be used. If they will be exposed to harsh conditions, you will need a more durable sealant that can withstand extreme temperatures and UV rays.
  • Second, you need to think about the level of protection you need. Some sealants are better at repelling water and dirt, while others are more effective at protecting against scratches and scuffs.
  • Finally, you should consider the aesthetic properties of the sealant. Some sealants can give your carbon fiber parts a glossy finish, while others are more matte. Choose a sealant that achieves your desired aesthetic properties on your carbon fiber parts.

Factors to Consider when Choosing the Best Polishing Product for Carbon Fiber

When it comes to polishing carbon fiber, there are a few things you need to take into consideration:

  • Choose a product that is designed specifically for carbon fiber. This will ensure that the product you’re using won’t damage the delicate surface of your carbon fiber.
  • Make sure that the product you choose is compatible with the type of carbon fiber you’re working with.
  • Be aware of the different polishing techniques that are available (Spray, cloth, roller, brush polishing) and choose the one that best suits your needs.

If you are looking for the perfect way to add a touch of elegance to your carbon fiber project, consider using gelcoat-specific glaze.

This polish is designed to be gentle on carbon fiber and will give your parts a deep shine without harming them.

By using this product, you can avoid the risk of damaging your carbon fiber surfaces with a harsh polish.

After how long does carbon fiber need polishing?

It turns out that the answer depends on a number of factors, including the type of carbon fiber, the environment it is exposed to, and the kind of polish that is used.

In general, though, carbon fiber should be polished at least once every two months to maintain its mirror-like finish.

What should a carbon fiber repair kit have?

If you’re going to be repairing carbon fiber, you need to have the right tools.

This means that a carbon fiber repair kit should have a microfiber cloth, spray wax, standard wax, carbon fiber glaze, epoxy resin, brush, roller, foam applicator, hand gloves, sander, and sealant.

With these items, you’ll be able to properly repair any damage to your carbon fiber and make it look good as new.

Why wax carbon fiber parts?

Waxing your carbon fiber parts is crucial because it will help to protect them from the elements.

UV rays can cause the carbon fiber to fade and become brittle over time, so it’s important to wax your parts regularly. Waxing also makes the parts easier to clean and helps to keep them looking new.

There are a few different ways to wax carbon fiber, but the most important thing is to use a high-quality wax designed for carbon fiber use.

You can either spray the wax on or apply it with a cloth. Either way, make sure you wax your parts regularly to keep them looking good and protected.

As a general guide, spray wax your carbon fiber parts once a week and apply wax to the carbon fiber parts at least once a month.


Carbon fiber is an incredibly versatile material with a wide range of potential applications. As we continue to develop new ways to use this material, the possibilities are endless.

Even though carbon fiber is one of the most versatile and durable materials available, it still needs to be properly cared for to maintain its strength and integrity.

Like with any other material, over time, carbon fiber can become damaged or weakened, eventually needing to be repaired or retouched.

Fortunately, we’ve discussed how to touch up and repair carbon fiber. By taking the time to properly care for your carbon fiber products, you can ensure that they look as good as new and last for many years to come.