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Best Auto Body Filler For Rust (2023 Updated)

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When it comes to auto body repair, rust can be a major issue. Rust can cause your vehicle to look unappealing, and it can even affect the safety of the vehicle if it's left untreated. Fortunately, there are auto body fillers available to help repair rust and restore your vehicle to its original condition. But before you go out and buy just any auto body filler for rust, here are five key points to consider:

1. The type of rust: Different types of rust require different types of auto body filler. For example, light surface rust can be repaired with a body filler that is designed to fill small scratches and voids. However, more severe rust damage may require a more extensive repair that involves welding and the use of an epoxy-based filler.

2. The curing process: Most auto body fillers require a curing process in order for them to be effective. This usually involves the use of a heat gun or a catalytic converter and can take anywhere from a few minutes to several hours, depending on the type of filler used.

3. The surface: Auto body fillers can be used on a variety of surfaces, from metal to plastic. Different types of fillers are designed to work with different surfaces, so make sure to read the product label before making a purchase.

4. The color: Most auto body fillers come in a variety of colors, so you should be able to find one that matches your vehicle's existing paint job.

5. The price: Auto body fillers range in price depending on the type of filler and the brand. Make sure to compare prices before making a purchase to ensure that you get the best deal.

When it comes to repairing rust damage on your vehicle, auto body fillers are a great option. But before you go out and buy one, make sure you consider these five key points to ensure that you get the best product for your needs. With the right auto body filler for rust, you can restore your vehicle to its original condition and make it look as good as new.

10 Best Auto Body Filler For Rust

1. Bondo Body Repair Kit, Original Formula, 12.6 Oz Filler & 0.5 Oz Hardener, 1 Kit

The Bondo Body Repair Kit is the perfect solution for DIY auto repair jobs. This complete kit is designed to easily fix dents, dings, deep scratches and more. The kit includes Cream Hardener, a Self-Adhesive Metal Body Patch, a spreader and the original Bondo Body Filler.

The Bondo Body Filler featured in the kit is the original filler used by professionals for over 60 years. It spreads easily and cures in just 20 minutes so that it can be sanded and painted. The kit provides the same materials used by collision repair pros and delivers amazing results.

This money saving kit is perfect for any do-it-yourselfer. With its easy to use design, anyone can quickly repair their vehicle and get it looking like new again. All components needed to make the repair are included, making it an easy and economical choice.

This kit is designed to make repairs faster and easier. The Bondo Body Filler will adhere to any metal, wood, fiberglass or concrete surface and is great for filling cracks, small holes and other imperfections. With the Cream Hardener and Self-Adhesive Metal Body Patch, you can make sure your repair is secure and long-lasting.

The Bondo Body Repair Kit is the perfect solution for all DIY auto repair jobs. With its easy to use design and professional quality materials, you can quickly and easily repair any damage your car may have, saving you both time and money. The kit is perfect for anyone who wants to restore their vehicle to its original condition and get it looking like new again.

2. Bondo Metal Reinforced Filler, 11.2 Fl Oz With Hardener

Bondo Metal Reinforced Filler is an easy-spreading filler that provides extra strength due to its aluminum reinforcement. This fast-dry formula allows you to work with it for five minutes and then start sanding in as little as 20 minutes. This product is exceptionally strong and can be drilled, anchored or tapped for repairs. It can be used on metal, fiberglass, masonry and wood for both auto and home projects.

Bondo Metal Reinforced Filler provides a metallic appearance that won’t rust, making it great for wood repair projects around the home where screws or bolts need to be replaced. It is also great for cosmetic repairs to auto parts such as frames, pillars, and outer rocker panels, and auto restoration. When cured, the product is grey but is paintable for surfaces that need to be a different color.

The product comes with a tube of hardener and directions for use. It is also part of the 3M Body Repair System, used in the Fill stage. Bondo Metal Reinforced Filler is perfect for both auto and home projects, providing a strong and durable solution for repairs. With its fast-dry formula and metal reinforcement, it is an ideal product for any project.

3. Duraglas Fiberglass Auto Body Filler, 1 Gal.

Duraglas Fiberglass Reinforced Auto Body Filler is a revolutionary product that will help you repair metal and fiberglass with ease. With its single short-strand fiberglass body filler, it is rust and waterproof, making it the perfect choice for a variety of repairs. The base color of the filler is a dark green, allowing it to blend in with the original color of your car.

This body filler is easy to use, allowing you to make repairs quickly and efficiently. It has a putty-like consistency that allows it to fill cracks and holes in fiberglass and give you a professional finish. The short strand fiberglass fibers in the formula make it extra durable and resistant to the elements. This product can be used to fill in rust spots and make repairs that will last for years.

This body filler is ideal for those who are looking for an affordable solution to their auto body repair needs. It is easy to use, and with its rust and waterproof properties, you can be sure that your repairs will last a long time. The dark green color of the filler makes it a perfect choice for those who want to blend in the repaired area with the original color of the car.

Duraglas Fiberglass Reinforced Auto Body Filler is a great choice for those who are looking for an affordable, yet durable solution to their auto body repair needs. With its rust and waterproof properties, you can be sure that your repairs will last a long time. The dark green color of the filler allows it to blend in with the original color of the car and is perfect for those looking to make a seamless repair.

4. Eastwood Custom Blended Contour Premium Body Filler Rust Inhibiting And Self Etching 25.3 Oz

Eastwood Custom Blended Contour Premium Body Filler is an excellent choice for fixing and restoring damaged body panels. With its rust inhibiting and self-etching properties, this body filler offers a unique one-step application with excellent feather-edging capabilities.

The rust-inhibiting technology helps protect your vehicle from corrosion, ensuring that your car remains in top condition for longer. The self-etching properties of the body filler allow for better adhesion to the surface, ensuring that your repairs are secure and durable.

The premium body filler has been designed to provide exceptional featheredging capabilities, allowing you to achieve a smooth finish and seamless repair. The filler has a smooth, creamy consistency that ensures easy application and excellent spreadability.

The 25.3 oz tub contains enough filler to repair a variety of body panels, making it an ideal choice for both professional mechanics and DIY enthusiasts. The filler is easy to sand, allowing you to achieve a perfect finish.

Eastwood Custom Blended Contour Premium Body Filler is the perfect choice for repairing and restoring damaged body panels. With its rust-inhibiting and self-etching properties, this premium body filler offers a unique one-step application with excellent featheredging capabilities. The 25.3 oz tub provides enough filler to repair a variety of body panels, making it an ideal choice for professionals and DIY enthusiasts alike.

5. 3m Bondo Rust Hole Repair Kit, Paintable, Permanent, Non-Shrinking, 1 Kit (31591)

The 3M Bondo Rust Hole Repair Kit is the perfect solution for repairing rust holes and preparing for painting with professional results. This kit includes Exact Mix pouches, which make it easier to mix the filler and hardener without any guesswork. With enough product for multiple rust holes, you can make durable and permanent repairs in no time. Plus, this money-saving do-it-yourself kit helps you remove unsightly rust spots that can be expensive to repair professionally.

The kit features the original Bondo Body Filler, Bondo Glazing and Spot Putty, and Bondo Red Cream Hardener. In addition, the kit comes with 3M Sandpaper in 80 Grit, 180 Grit and 320 Grit, perfect for cutting fast and lasting long. It also includes a Bondo spreader and Bondo metal patch. The kit packaging can be used as a convenient mixing board.

This kit is an excellent part of a complete body repair system from 3M and Bondo. With these easy-to-follow instructions, you can complete rust hole repairs in less than three hours. This kit is perfect for those who want to save money and have the satisfaction of knowing they can do it themselves. With the 3M Bondo Rust Hole Repair Kit, you can have confident and professional results.

6. Bondo Bondo-Hair Long Strand Fiberglass Reinforced Filler, 00762, 1 Quart

Bondo Bondo-Hair Long Strand Fiberglass Reinforced Filler is an effective and efficient solution for tackling challenging projects such as vehicle restoration, shattered fiberglass repair, and filling metal rust holes up to 1” in diameter. This fast dry formula allows for sanding in only 20 minutes and is compatible with most paints and paint systems, making it suitable for use on cars and boats.

This product is designed for easy use, with step-by-step instructions included. It offers twice the strength of regular body filler, allowing you to fill holes up to 1” wide and rebuild missing pieces without backing strips, cloth, or mat. The filler also comes with Bondo Red Cream Hardener, which helps harden the filler and ensure a strong bond.

The Long Strand Fiberglass Reinforced Filler is an excellent choice for anyone looking to restore or repair a car or boat. It is strong, waterproof, and easy to use, so you can be sure that your project will be completed quickly and with lasting results. Whether you’re looking to fill holes or rebuild missing pieces, this product has you covered.

7. Contour Body Filler Kit – Self Etch, Rust Resist, 0.8 Gal

Eastwood Premium Contour Body Filler offers a quick and easy one-step process for auto body repairs. This self-etching repair kit is specially formulated to adhere to aluminium, steel and fiberglass bodywork, and provides a rust-preventing inhibitor to extend the lifetime quality of your repair work.

Using the Eastwood Premium Contour Body Filler is simple. Apply a thin layer over clean, contaminant-free bodywork and wait 3 minutes for it to begin hardening. After this, apply a second, thicker layer to meet your requirements, and wait around 15 minutes before you can start sanding. This product is easy to feather edge and sand, making it perfect for a variety of automotive repairs.

Eastwood is known for their high-quality, innovative products and provides a lifetime tech support for their customers. With this product, you can trust that you are receiving a safe and reliable product that is backed by a 90-day limited warranty and 90-day return.

When using this product, it is important to always wear eye, skin and respiratory protection, and to apply in a well-ventilated area. Be sure to consult the MSDS and product label for specific safety warnings.

For a fast and easy one-step solution to auto body repairs, choose the Eastwood Premium Contour Body Filler. This product is trusted by top builders and beginners alike, and provides an excellent self-etching property and superb adhesive strength. With its rust-preventing inhibitor, you can trust that your automotive repair work will last for years to come.

8. Permatex 25909 Liquid Metal Filler, 3.5 Oz.

Permatex Liquid Metal Filler is a versatile and easy to use product that can be used on metal, wood, and concrete surfaces. This filler is ideal for repairing cracks or porosity leaks in cast metal parts, as well as for filling small holes, cracks, and perforations. It bonds strongly to galvanized metal and is resistant to water, oil, and gasoline, making it highly versatile and durable.

The application process is simple and requires minimal preparation. To apply the Liquid Metal Filler, simply clean the surface to be repaired and then press the filler into the area. The filler will cure in 15-20 minutes, and will be dry to the touch after about 1 hour. Once dry, it can be sanded, drilled, and painted over, allowing for a virtually seamless repair.

Permatex Liquid Metal Filler is an excellent choice for a variety of repair projects. It is ideal for repairing cracks or porosity leaks in cast metal parts, as well as for filling small holes, cracks, and perforations. The filler bonds strongly to galvanized metal and is resistant to water, oil, and gasoline, making it highly versatile and durable. The application process is simple and requires minimal preparation, and once dry, the filler can be sanded, drilled, and painted over for a virtually seamless repair.

9. Bondo Spreader 3-Pack, 00357, 3 Sizes Per Pack

The Bondo Spreader 3-Pack, 00357, is the perfect choice for any auto body repair project. This 3-pack of spreaders contains three sizes – 3" X 4", 3" X 5", and 3" X 6" – ensuring that you always have the right size for the job. The thin, clean edge of each spreader improves control, allowing for a smooth application of filler, putty, spackle, caulk or glaze.

This spreader is made of flexible plastic, allowing it to be used on curved surfaces with ease. The plastic construction also makes it durable and easy to use. The Bondo Spreader 3-Pack, 00357, is designed specifically for spreading filler, putty, spackle, caulk or glaze and is the perfect choice for auto body repair projects.

The Bondo Spreader 3-Pack, 00357, is the perfect choice for auto body repair projects. This 3-pack of spreaders contains three sizes – 3" X 4", 3" X 5", and 3" X 6" – ensuring that you always have the right size for the job. The thin, clean edge of each spreader improves control, allowing for a smooth application of filler, putty, spackle, caulk or glaze. The flexible plastic construction ensures that it can be used on curved surfaces with ease, making it the perfect tool for any automotive repair project.

The Bondo Spreader 3-Pack, 00357, is specifically designed for spreading filler, putty, spackle, caulk or glaze. Its thin, clean edge improves control, allowing for a smooth application. The flexible plastic construction makes it durable and easy to use on curved surfaces. This 3-pack of spreaders is the perfect choice for any auto body repair project, ensuring that you always have the right size to create your best work.

Best Auto Body Filler For Rust FAQs

Can you put body filler over rust?

Yes, you can put body filler over rust, but it is not recommended. Rust is a sign of corrosion, and corrosion can cause damage to the structural integrity of the metal. Body filler is a short-term solution, and it will not protect the metal from further rusting or corrosion. It is best to remove as much of the rust as possible and repair the area with quality rust-preventative materials. It is also important to properly prepare the surface before applying body filler, as the body filler will not adhere properly to rust. If the rust is not removed, the body filler may not last as long and could be prone to cracking, flaking, bubbling, or other damage.

How do you fill rust holes with body fillers?

Rust holes can be filled with body fillers, such as Bondo, to restore a vehicle’s body to its original state. To begin, the rust should be removed using a wire brush or sandpaper. After the rust is removed, the area should be cleaned of any dust and debris. Next, a rust-resistant primer should be applied to the area. After the primer has dried and cured, a body filler can be mixed with a hardener and applied to the rust hole. The body filler should be spread evenly and allowed to cure before sanding it down to a smooth finish. Once the body filler has been sanded down, primer, paint and/or clear coat should be applied to the area to complete the job.

What can I use to fill in rust on my car?

The best way to fill in rust on a car is to use a rust repair kit. These kits come with everything you need to not only fill the hole, but also to prevent the rust from returning. The kit includes a rust-inhibiting primer, a rust-resistant filler, and a sealant to protect the area from further damage. Before filling in the rust, you will need to sand the area to remove any loose particles and then wipe the area clean. Once the area is prepped, use the primer to prevent the rust from returning, the filler to fill in the hole, and the sealant to protect the area from further damage. Allow the area to dry thoroughly before applying any additional coats of paint.

Will rust come through Bondo?

No, rust will not come through Bondo. Bondo is a brand of automotive body filler, which is a two-part putty that is used to fill in small dents, dings, and scratches. It is designed to seal out moisture, which makes it an effective barrier against rust. It will, however, not prevent rust from forming if the area is not properly prepped and painted. In order to ensure the highest level of protection against rust, it is recommended to sand down any rust spots, clean the area, and then apply Bondo before any primer and paint.

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