Luxury automobile with shiny headlights in vibrant smoke on wet asphalt surface during rain

The Best Auto Body Filler For Rust: The Ultimate Guide To Get You Started

No matter how carefully you drive, every vehicle’s body can end up with minor surface damage. There are dents, dings, scratches, and holes, or it was caused by debris strikes, minor collisions, or even the time you opened your door too close to that fire hydrant. They can ruin your car’s appearance, and they can lower the resell value.

A small amount of damage to your car can cause a huge hit in the value, but a simple modification can change the look of your vehicle. For repairs of this type of damage for decades, car body filler has been the go-to solution. 

Auto body filler is a common product used by car owners to fill in dents and other imperfections on their cars. For repairing dents and restoring cars’ bodies, knowing about the best auto body filler for rust is very important. In this article, I will review some of the best auto body fillers for rust.

How To Choose The Best Auto Body Filler For Rust?

black Volkswagen Beetle beside beige wall

In order to fix your car, you need to choose a good auto body filler. There are many different types of auto-body fillers available today. Most of them work pretty well, but they also have their limitations. Here are some things for choosing the best auto body filler for rust:

Easy to Use

It is important that you have easy-to-use car body filler. It will be spread across several different areas. If you want to mix it, look for a filler that is easy to mix. When mixed, some fillers are designed to change color. As you spread the material onto the vehicle panels, this can help you to see it easier.

Material Compatibility

The metal on your car must be galvanized if it is relatively modern. Just make sure you choose a filler that can bond with the materials you need for your car body rust repair.

Product Size

It’s largely down to the size of the repairs you need to perform that you’ll be using a lot of filler. It can be tempting to buy a smaller-sized product if you only have shallow surface dents. You’re all set for multiple automotive rust repair if you have a gallon of the stuff.

The Top Best Auto Body Filler For Rust

Bondo Body Filler, Original Formula for Fast, Easy Repair & Restoration of your vehicle.

Bondo is a brand name made by 3M, so technically it’s a 3M body filler. This example is from the premium end of the market, and Bondo has a reputation for making great car filler products. It’s lightweight making it perfect for fixing small dents and dings that are the most common type of damage a vehicle will pick up on a daily basis.

The two-part putty compound is composed of high-quality filler and a hardener. The formula is designed to be non-shrinking and durable. It is easy to sand to a smooth finish, and it is waterproof. It is compatible with a huge range of materials, and it takes on a soft pink color for easy visuals when spread.


  • Non-Shrinking Formula
  • Easy Mix & Smooth Spread
  • Wide Material Compatibility


  • Very sticky
  • Not easy to apply

Permatex 25909 Liquid Metal Filler, 3.5 oz.

A non-shrinking formula that is vacuum processed for smoothness is called Permatex 25909. It easily takes the shape of the affected area, regardless of the damage, because it is very adaptable during the application. Most of the time, it is used to repair cracks and seal leaks within a car’s cast metal body. This filler is incompatible with gasoline oil and water, meaning it cannot be easily removed.

It’s known for its outstanding damage masking qualities and it’s a liquid metal filler. Ideally, this auto-body filler can be used for bonding dents on a wide range of surfaces, including concrete, wood, and galvanized metal. It works perfectly on car bodies that have a reliable adhesive and also it works on car door rust repair.


  • Easy to mix 
  • Durable
  • Lightweight 
  • Adaptable applications
  • Wide compatibility 
  • Versatile to perforations
  • Metal tough bond
  • It is not compatible with water, oil, and gasoline


  • It doesn’t get dry fast
  • When dry, a few coats crack

Dynatron Dynalite Body Filler, 492, 1 qt.

There are a lot of interesting features in this one. With optimal performance characteristics, the compound was designed to mix easily with the hardener. It’s ideal for tackling surface dings and dents on the vehicle because of the lightweight coverage level. As we have seen with the other 3M products, the quality of the glue is just as good as you would expect from this manufacturer.

It is similar to previous products from this brand and has a drying and curing window of around 20 minutes. Once dry the formula is designed to be easily sanded for a professional-level smooth finish. It is great to see that this is compatible with all the paint systems out there.


  • Lightweight
  • Smooth material for easy spreading
  • Excellent adhesion 
  • Compatible with nearly any paint system


  • For industrial/occupational use only

Bondo Glass Short Strand Reinforced Fiberglass Filler, Stage 2, 2.56 Oz Filler, and 1 Oz Cream Hardener.

The Bondo Glass Reinforced Filler is the best body filler on our list. Premium performance is provided by this auto body filler when it is used to refill and restore damages to your car. This auto body filler can be used on auto body repair rust, repairing dents, and as a foundation in a car’s body holes.

The fiberglass strands that interlock for better filling strength are reinforced with this body Filler. Due to its thickness and fast-drying feature, this filler is twice stronger as other car body fillers. As a body repair kit, it also comes with a red Cream Hardener, compatible with this filler. As you repair holes, you won’t have to use backing cloths, fiberglass strips, or resins.


  • It’s easy to apply and mix
  • Sanding and quick-drying.
  • Stronger than its competitors
  • Wide compatibility 


  • It might be expensive to ship it if you are overseas

Evercoat Rage Gold Body Filler for Fiberglass, Aluminum & More – Stain-Resistant Filler – 128 Fl Oz.

shallow focus photography of orange Volkswagen Beetle

The product has a long name and a high price tag, but it is also a truly premium product. A range of outstanding features, many of which add to the feeling of a really high-end product here, is what it is boasting. One of the highlights is the fact that the compound has been formulated to contain a radioactive substance. Once it has been applied and allowed to dry, the mystery “ingredient X” style Additive has been added to improve the salability of the filler.

It’s important to note that this product has been formulated for superior adhesion to galvanized steel and aluminum. In fact, this product makes an excellent choice for use on vehicle bodywork, especially modern vehicles.


  • There is Hattonite
  • Adhesion to aluminum and steel
  • Vacuum Processed


  • It’s too expensive

Frequently Asked Questions:

What is auto body filler for rust, and why is it necessary?

Auto body filler for rust is a type of repair material used to fill and repair rusted or damaged areas on a vehicle’s body. It helps restore the vehicle’s appearance and structural integrity.

How does auto body filler for rust work, and what does the repair process involve?

Auto body filler for rust is typically a two-part compound that, when mixed, forms a paste. It is applied to the rusted area, shaped to match the surrounding contours, and sanded smooth once it dries. This process restores the damaged area’s appearance.

Can I use auto body filler for rust on all types of rust damage, or are there limitations to its effectiveness?

Auto body filler for rust is most effective for surface rust or small rusted areas. It may not be suitable for extensive structural rust or areas where the integrity of the vehicle’s frame or body panels is compromised.

What are the different types of auto body fillers for rust available, and how do they differ?

Auto body fillers for rust come in various types, including traditional polyester fillers, epoxy-based fillers, and newer hybrid products. They differ in terms of their bonding strength, flexibility, and resistance to moisture.

How do I choose the best auto body filler for rust for my specific repair project, and what factors should I consider?

When choosing an auto body filler for rust, consider factors such as the extent of rust damage, the type of surface you are working on, the product’s compatibility with other repair materials, and user reviews to find one that suits your needs.

Final Words

It is important to keep your car safe. In order to repair the damage, you need to know what exactly needs to be done. The filler is a material that can be used to repair the damaged area of your car. We hope these products are the best auto body filler for rust. You can choose one of them. But, before buying, always read the pros and cons very carefully.

What do you think?

Written by webmaster_kzwort

The Most Comfortable Head Support For Infant Car Seats: An Expert Guide

Blue Car on Dirt Road Between Green Leaf Trees

The Best Jeep Hardtop Hoist: Make Removing & Installing Your Top A Breeze!