Can You Fiberglass Over Bare Metal?[A Full Discussion]

can you fiberglass over bare metal

Fiberglass is a versatile material in which you can use most of the metals. However, fibreglass is also well-known in the automotive industry. But, you may think more about fiberglass before applying anywhere.

So, can you fiberglass over bare metal? The answer is yes. You can use fibreglass over the bare metal. But, you need to clean the bare metal properly and also need to use epoxy before applying fibreglass over your bare metal.

This article helps you to know which things you need to consider before using fibreglass. So, keep reading to get further information.

What Is Fiberglass?

Fiberglass is a type of product which is used on several materials. It protects the metal from scratches and also avoids discolour or harmful external things from the metal.

Moreover, fiberglass is easy to use on bare metal and users can also apply other types of materials. I used fiberglass on my bare metal without facing any troubles.

Furthermore, fiberglass also avoids heat and keeps the metal fresh on the external sides. There are plenty of advantages you will get from fiberglass.

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Can You Fiberglass Over Bare Metal?

The official answer is yes. You can use fiberglass over bare metal without facing any troubles. But, you should keep in mind that it is not a long-term solution.

After a time, fiberglass lost its period and damaged itself. On the other hand, you also need to use a primer before using fiberglass on bare metal to get long-time performance.

Similarly, fiberglass and bare metal are two different types of materials that’s why they are hard to bond permanently. But, it doesn’t mean that fiberglass doesn’t provide you with long-term performance.

Undoubtedly, fiberglass is one of the best solutions for repairing metallic components in your car. Fiberglass easily and quickly repair the metallic components so that you can save time.

Overall, fiberglass is ready to provide all-rounder performance. Note, if you want to consider fiberglass on your bare metal, you need to think about its durability.


  • Provides quick and easy solutions
  • Easily repair the metallic components
  • Hassle-free to use on the bare metal
  • Comes with a less expensive price
  • User-friendly


  • May be not much durable
  • It is not suitable for permanent

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How To Fiberglass Over Bare Metal?

If you decide that you want to use fiberglass over the bare metal, this section is for you. From this section, you will get a step-by-step guide to safely use the fiberglass.

  • Step 1: Collect Essential Materials

Before starting the project, you have to collect mats, resin, and fiberglass. Collect them as soon as possible and jump the following steps.

  • Step 2: Scuff Up the Surface

You have to scuff the latter surface and you may need to spend much time to do it. After that, you need to provide a metal rough finish to promote better adhesion.

You can use a grinder or sandpaper to complete this process. I am going to use a grinder to finish this step.

  • Step 3: Clean the Metal Surface

Before applying fiberglass, it is truly essential for you to clean the surface properly. You can use a microfiber cloth to clean the metal properly. Or, you can also use other tools to clean the metal.

  • Step 4: Lay the Fiberglass Mat

To lay the fiberglass mat, you have to cut the mat in the right size so that you can easily adjust it. You need to cut several pieces of mat to lay the whole area.

Note: You need to use as much as a layer of fiberglass because they are staying short of life.

  • Step 5: Mix Resin & Complete the Process

Now, it is time to complete the process. You have to mix the resin with the fiberglass so that it becomes harder and you will get a long-time performance.

Avoid These Mistakes When you use Fiberglass on bare metal

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Should You Paint Epoxy Primer Before Using Fiberglass Over Metal?

There are plenty of ways I found that help the users to use fiberglass over metal. But, most of them are not worked properly. However, using an epoxy primer is one of the best solutions for it.

Undoubtedly, you can use an epoxy primer before using fiberglass on the bare metal or over the metal. But, you should keep in mind that you used quality epoxy.

However, I don’t tell you that epoxy primer provides you with a permanent solution. But, it works much better than other solutions.

So, without thinking anymore, you can use paint epoxy primer before using fiberglass over metal. I hope that this section clears up your confusion.

Can You Put Fiberglass Resin Over Metal?

Of course, you can put fiberglass resin over metal. Because resin and fiberglass combined become harder and help the metallic components repair.

But, before using fiberglass and resin over metal, you need to clean the metal properly. You can use sandpaper or grinder to clean the metal properly.

Similarly, you can put epoxy resin and fiberglass over the metal. It is truly essential for a person to use the perfect amount of fiberglass and resin to get better results.

Fiberglass Vs. Welding Sheet Metal

Fiberglass and welding sheet metal are two popular products that quickly and easily repair the metal components of the car.

But, they have some little differences. I made this table for you so that you can easily find out the differences between fiberglass and welding sheet. So, let’s break down the following table.

FiberglassWelding Sheet Metal
Fiberglass is less durable than welding sheetWelding sheet is more durable to use
Provides quick solutionIt takes some time to work
It is less expensive to buyIt is expensive to buy
Easy to useWelding sheet need proper guide to use

What Is The Role Of Scuffing Bare Metal Before Adding Fiberglass?

If you want to do some paint over the metal, you need to scuff bare metal before adding fiberglass. But, how can you do that?

First, you need to take a grinder or sandpaper to scuff the bare metal. You need to provide some extra pressure to scuff the bare metal.

After that, you need to use microfiber to clean the metal surface properly. When you complete the cleaning process, you can use fiberglass to get the best performance.

Will fiberglass Stick to Stainless Steel?

When you use epoxy resin with fibreglass, it sticks and becomes harder. But, the fiberglass may not last long. Because stainless steel metal is not adjusted properly.

On the other hand, you have to use quality fiberglass so that it can provide long-time performance. Moreover, you also need to use multiple layers of fiberglass to get a longer performance.

Overall, fiberglass does not stick properly when you only use fiberglass. You should use epoxy resin and other things to get lasting performance.

How Long Will Fiberglass Rust Repair Last?

It depends on several factors. According to my experience, fibreglass rust repair lasts nearly 3 months. Moreover, some of the fiberglasses last more than 4 months.

On the other hand, quality fiberglass provides more performance than normal fibreglass. So, before purchasing fibreglass for your rusted or bare metal, you should choose the best fiberglass.

What Should You Keep in Mind Before Using Fiberglass Over Bare Metal?

Before using fiberglass over bare metal, you have to maintain some principles. Check out the following serious points to using fiberglass over bare metal properly.

  • Before using fiberglass, you should use epoxy resin
  • Clean the metal surface before using fiberglass
  • Take time and apply fiberglass properly
  • Before using fiberglass and epoxy, you should wear hand gloves
  • Try to consider the best quality fiberglass
  • Use multiple fiberglass layers

FAQs (Frequently Ask Questions)

Q: Does fiberglass stick to bare metal?

Answer: Fiberglass stick to bare metal but after sometimes it will be released. Moreover, you can use adhesive on dry fiberglass. So, you should not worry about the stick problem on the bare metal.

Q: Will rust come through fiberglass?

Answer: Fiberglass does not produce rust. Fiberglass is ready to protect the car’s metallic components from rust and other harmful things. There are no ingredients for fiberglass which creates a rust problem.

Q: Does fiberglass last in the sun?

Answer: If the fiberglass does not come with sun protective features or UV protection, the fiberglass becomes weak without any doubts. Before purchasing the fiberglass, you should check out that fiberglass is ready to last on the sun.

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