8 Best Body Filler for Fiberglass: Pros and Cons

Car body fillers are made of resin and hardeners. They can be mixed to create a smooth mixture for filling holes or covering scratches. This is also called vehicle putty.

You might need this if you have dents, scratches, or hail damage on the outside of your car.

There are many types of car body fillers. To find the right one for your project, you need to know what type of vehicle or surface you’re working on. For example,

if you have a truck, then use truck filler. Or If you want to fix scratches on your car, use a special paint that is made for cars.

We’re going to review the best body fillers for fiberglass. This will help you find what’s right for your project, take a look.

Are You In Hurry? Then Check Out Below!

If you literally don’t have much time to read the complete article. Then you can also go with this Bondo Body Filler. This amazing product comes equipped with microspheres designed for repairing easily and quickly, so there’s no need to spend countless time trying to fix these small imperfections by hand when they’re easy enough to fix technologically.

Bondo Body Filler – Best One

Bondo Body Filler - Best One
  • Original formula for repairing dents, dings, holes, large rusted areas and scratches in vehicles
  • Two-part lightweight compound mixes easily and spreads smoothly
  • Spread easy and cures in only 20 minutes for same day repairs
  • Formulated to be non-shrinking
  • Suitable for wood, steel, fiberglass, and concrete

Buying Guides Before Purchasing Best Body Filler For Fiberglass

To make your car’s body filler work better, there are a few things you can do. In the next section, we will talk about some of these things.


Before doing anything, take a little time to assess the damage you want to repair. You want to look for some things here. First, you need to assess the extent of the damage, specifically the size of the area that has been affected, as well as the depth of the dents and dents.


As part of the evaluation process, you should also check what material you need to work on. Here you can also save a lot of time and money. Dented both the bumper and the bodywork? If so, keep an eye out for body filler that can bond to both plastic and metal, and you could save some savings here.

Get to the hands!

Or rather, don’t be afraid to get physical! Remove the panel (or stand behind it with the car raised if necessary) and hammer the rear of any major dents. Not only is it a great stress reliever, but you will also be amazed at how much actually goes into the vehicle body. Any degree of dent that you can hammer back into place is a repair that is not left solely to the body filler to take care of.


Like a good cocktail, the effectiveness of its filling is in the mix. For the product to work effectively, the mixture of filler and hardener must be correct. We highly recommend that you read the instructions included with any filler product you choose,

although a general rule of thumb is that the mix will be one part hardener to fifty parts filler. Of course, if you choose a premixed product, you don’t have to worry about this!

Softly it does

Our next recommendation is easier said than done! However, try to remember that you should always try the smoothest filler application you can achieve. Yes, you can sand over the application once it has dried. But by applying the filler gently, you avoid having to put too much time and energy into sanding. Let’s face it, sanding isn’t the most fun activity, is it?

Practice makes perfect

If you’ve never used body filler before, don’t be afraid to practice; in fact, we recommend it. Get yourself a scrap piece of wood or something flat but stable like an old wooden clipboard; literally anything, an old pizza box will do! Mix up your filler, and then apply it to the surface of your practice.

This allows you to practice two things before getting in the car. First, it allows you to practice mixing your specific filler and hardener so you know you have the correct ratio before you begin. It also allows you to practice using your applicators, so you can get that filler nice and smooth when it’s time to really get to work on the vehicle.

Get a good applicator

Finally, and we already mentioned it before, so sorry for repeating us! But with that said, we believe that a good applicator is such an important part of the process that we have to shout it out again here – make sure you get and use a good applicator!

Some types of professional body shops that we know even make their own, with the applicator cut to the curves and lines of the body of the vehicles they work on. You don’t need to go that far yourself, but buy a pack of premium applicators, ideally of different sizes, at the same time as you buy your filler. Trust us; it’s worth the little extra investment.

Best Body Filler For Fiberglass – Reviews

1. Bondo Body Filler – Best One

Best Body Filler For Fiberglass

Bondo is a well-known brand in manufacturing products that are effective and of high quality. This product contains microspheres, which help in repairing easily and quickly. It is my best overall product. it is a two-part solution. One part is like a hardener and one is resin. You use it to repair holes, dents, and scratches on the outside of your car.

Surfaces like metal, wood, concrete, fiberglass, and more mold and cure in minutes. Plus, this filler is a durable option that will give you the perfect vehicle exterior or other surfaces.

Want to buy this? It will come with a tube of hardener which when mixed with the filler will turn into creamy stuff. Mix it together and it will fix the dents, scratches, or rust. This filler will harden up quickly so you need to put it on quickly. But if you are working on larger areas, this will not be a problem.

  • Top brand filler
  • Non-shrinking and durable
  • Cures fast and shapes in minutes
  • Super easy to use
  • Consists of microsphere formula
  • Hardens up too fast

2. Evercoat 125 Rage Ultra Body Filler

Evercoat 125 is the best body filler if you need something that has good sanding capability and can remove more than other fillers. It is special because it uses a kind of technology that never wears out. It also does not sag like other fillers do, so it stays in place better.

You don’t need to use putty after using this product. This saves you time and money. You also get a hardener when you buy it, so it is ready to use as soon as possible. If you are not used to using this product, it can be difficult to cover large areas. But if you practice or use it for a long time, it will be easier.

  • You will not need any putty
  • Hardener included for immediate use
  • Superior sanding capability
  • Formulation ensures it does not sag
  • A little hard on armatures

3. Evercoat 156 Light Weight Body Filler

Evercoat brings you this car body filler. It works for heavy filling and repairing of panels that are up to 1/2 inch in depth. It has a blue color hardener mixed into the cream, which makes it easy to use. If you buy this package, it will go a long way.

Also, This filler is good because it spreads evenly and doesn’t harden while applying. It sticks really well to different surfaces, and leaves a smooth finish that needs minimal sanding.

This car body filler is high quality and does not have clogs. It is easy to apply and will not create a lot of air bubbles. The can has 3 liters, but you may think there’s only about 2 liters left in the can. But that’s actually more than enough product, because it has 3 liters of product in it rather than 2 like most other products. You will get the right amount for your money.

  • Made with clog free formula
  • Perfect for heavy filling
  • Superior adhesion
  • Good value for money
  • Creamy texture provides smooth application
  • Can seems 3/4 full

4. Permatex 25909 Liquid Metal Filler

The Permatex 25909 Liquid Metal Filler is a liquid compound that does not require mixing. Simply remove the lid from the tube, squeeze it into cracks, dents or dings and smooth down with your hand.

It is easy to use and it is a good adhesive. It sticks to things well and it works on a lot of different materials like metal, wood, and concrete.

Once applied, this product will keep water, oil and gasoline from getting in your car. It is not for big areas of damage on your car. But if you have small spots.

  • Repairs cracks and small holes
  • Relatively affordable
  • Works for oil pans, door panels, cast metal parts
  • Amazing adhesion to galvanized metal
  • There is little filler on the tube

5. Dynatron Dynalite Body Filler

3M body filler is an excellent product and it does not need to be disguised as something else. We don’t understand why 3M needs to do this, but we are glad that they have a sense of pride for their own work. This product is best for people who want to fill some cracks, dents and even small holes.

This product is high-quality and has a lot of interesting features. It’s made for easy mixing with the hardener. It is light for its coverage level, which means it’s good for small surface dings on a vehicle. This product from 3M adheres well, just as you would expect from this company.

This product also has a drying time of around 20 minutes. Once the paint is dry, it will be easy to sand for a smooth finish. This filler works well with every kind of paint you can think of, so you are free to choose whichever one you want.

  • Smooth and premium finish
  • Wide applications
  • Easy to apply and sand
  • Can be a little hard to spread

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6. Evercoat 112 Rage 3 Liter Gold Premium Lightweight Body Filler

This product has a long name and it is very expensive. It has many features that make it feel like an expensive product. The price also makes you think that it is worth the money too, so what are you really getting?

One of the big things about this compound is that it has Hattonite in it. This makes the sand easier to work with after being applied and dried.

The product was also vacuum processed when it was made. That makes the paint stick to the metal and dry smoothly. It is good to know that this paint can be used on aluminum and steel, which makes it perfect for use on vehicles like cars because they are often made of these materials.

  • Easy application and easy sanding
  • Lots of filler in the container
  • Top quality, lightweight filler
  • Stain resistant
  • Repairs sensitive metals easily
  • Relatively expensive

7. Bondo Body Repair Kit

3M Bondo 312 is a kit. It has everything you need to work on your car. The company has been around for more than six decades, and they know what they are doing!

This is a kit that helps you fix scratches, dents, and rust holes on cars. It contains metal patches to cover the holes, cream to repair hard parts of the car, and a Bondo filler for filling in the small cracks.

This Bondo body filler dries quickly and sticks to where you apply it. It is strong and durable. You will want to use a spreader for flat surfaces or curved ones, but when you are used to using this product it will be an advantage.

  • Super easy to use
  • Great value for cash
  • Comes as a complete body repair kit
  • Repairs large holes and deep scratches easily
  • Hardens a little too quickly

8. Bondo Glass Reinforced Filler

Best Body Filler For Fiberglass

The Bondo Glass 00272 will give a car a much better finish. It is more than twice as strong as regular fillers. It also cures faster and it is ready to sand after 20 minutes. This makes car repairs faster!

This will be a good product when you do a fix for the body of your car. It will work well with any paint type and is not restricted to only one kind of car.

This filler is waterproof. It will work for boats and cars. When the fiberglass bits are mixed with the filler, it can be hard to spread. But you should still be able to do it with effort and practice.

  • Strong filler that cures fast
  • Perfect for complete body repairs
  • Works with different paint types
  • Completely waterproof
  • Can be a little hard to spread

Beginners Guide to Applying Body Filler

Best Body Filler For Fiberglass – (FAQ)

What is the difference between putty and putty?

Putty is typically softer than filler and is therefore only used to treat small impressions or in the final prep stages after the filler is applied. Filler can be used to fill larger holes and cracks; something caulk cannot do.

Will body fillers crack?

Body fillers may crack when not applied correctly. But as long as you don’t apply it to dents that are deeper than 1/8 inch and give it plenty of time to cure, the filler should not crack

What type of body filler is used in Overhaulin?

They use Evercoat, which is also what many other auto repair TV shows seem to prefer to use.

What dent can I fill with Bondo?

Bondo can really fill in those big, troublesome holes. However, Bondo seems to work best indents up to 1/4-inch deep. With that said, the particular type of Bondo you are using also determines the size of the dent you can fill.


Choosing the best body filler to repair dents and scratches on your vehicle shouldn’t take much effort, as now you only need to choose one option from the previous losses.

And to help narrow your options even further, 3M Bondo 261 is our best overall product, being a high-quality product from a reputable brand that cures quickly and works on various surfaces.

For those looking for the best value for their money, the Evercoat 156 is what we recommend, while the 3M Bondo 233 is the best option for professional use.

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