Marianne Martinez
Rust on your car's floor pan is a common issue, especially in early unibody-based cars. It's caused by water seeping in through the seam-seal between sheet metal panels. But don't worry, you can tackle this issue and restore your car to its original state. There are various methods to remove rust from your car's floor pan, including using chemical treatments, wire brushes, and sandpaper. Some popular products for treating rust include POR-15, Rust Bullet, and Evapo-Rust. After removing the rust, you may need to weld in new metal patches and apply primer and paint to restore the floor pan to its original state.
Characteristics and Values for Killing Rust on Metal Auto Floor Pan
| Characteristics | Values |
|---|---|
| Rust removal tools | Wire brush, angle grinder, right-angle die grinder, cutting tool, sandpaper, naval jelly, knotted wire wheel, air-powered impact needle scaler, cutting discs, sandblasting, stiff wire brush, grinder, muratic acid, kerosene, sandblasting |
| Rust removal products | Rust Bullet, POR-15, Rustoleum, Rust Mort, Chassis Saver, Evapo-Rust, Rustoleum Primer, Marine Clean, Snap On gasket cleaner |
| Post-rust treatment | Metal prep, primer, filler, paint, fiberglass, aluminium flashing, weld through primer, sheet metal, welder, copper backing plate, bead roller |
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What You'll Learn
Use a wire brush to remove rust
If you have rust on your metal auto floor pan, one way to remove it is to use a wire brush. This method can be used for light surface rust or pitted rust.
For light surface rust, a handheld wire brush can be used to descale the metal. You can also use a wire brush drill bit attached to a drill to make the job easier. After brushing, vacuum the area and wipe it down with a sterilizing agent such as lacquer thinner, acetone, ketone, or wax and degreaser.
For pitted rust, a stiff wire brush can be used to remove the rust. You can also use a wire brush attached to a grinder to make the job easier. After brushing, neutralize the acid with kerosene, then coat the area with a rust converter product, such as Rust Mort, and seal it with a product like Chassis Saver or fiberglass.
It is important to note that using a wire brush may not remove all the rust, especially in pitted areas. In these cases, you may need to use additional methods, such as sandpaper or a grinder, to completely remove the rust. Additionally, always wear gloves and long sleeves when working with rust removal products and rust converters to protect your skin.
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Degrease, clean, and dry the metal
Degreasing, cleaning, and drying the metal are crucial steps in preparing the surface for further treatment and ensuring the desired outcome. Here is a detailed guide to help you through the process:
Degreasing the Metal
Degreasing the metal surface is essential to remove any grease, oil, or other contaminants that may interfere with the rust removal and protection process. There are various degreasing products available, such as Krud Kutter, Zep degreaser, or laundry detergent. You can fill a pump sprayer with the degreaser of your choice and spray it onto the metal surface. Allow the degreaser to soak for a few minutes to penetrate and break down the grease and oil. Then, use a pressure washer or a power washer with a "sandblasting" attachment to thoroughly clean the surface. For smaller projects or hard-to-reach areas, a rag or brush can be used for scrubbing.
Cleaning the Metal
After degreasing, it is important to clean the metal surface further to ensure all contaminants are removed. For this step, you can use various cleaning agents such as isopropanol, methanol, acetone, or dish soap/detergent. These agents can be applied with a rag or brush, ensuring that you scrub the surface thoroughly. Additionally, a wire brush attached to a drill can be effective in removing surface rust. If you are dealing with heavy rust buildup, you may need to use sandpaper to sand the surface after cleaning. This mechanical abrasion helps create a smoother surface and removes any remaining rust.
Drying the Metal
Ensuring the metal surface is thoroughly dried is crucial before proceeding to the next steps of rust treatment and protection. The drying process can be accomplished by using a clean rag to wipe down the surface. In some cases, compressed air or a heat source may be used to accelerate the drying process, but exercise caution to avoid damaging the metal. It is important to ensure that the metal is completely dry to the touch before moving on to the next steps of rust treatment and protection, such as applying a rust converter or a rust-inhibiting primer.
Remember, safety should always come first. Wear appropriate protective gear, including gloves, eye protection, and a respirator, when working with chemicals and during the cleaning and drying process. Always work in a well-ventilated area to avoid inhaling harmful fumes.
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Apply a rust converter or neutraliser
Rust converters are chemical solutions that treat rusted metal surfaces by converting iron oxide (rust) into a more stable compound. Active ingredients like phosphoric acid or tannic acid are commonly found in rust converters, which react with the rust to form a protective barrier that prevents further oxidation.
Before applying a rust converter, it is important to ensure that the surface is free from grease, oil, and dirt, as these contaminants can interfere with the chemical reaction. Use a wire brush, sander, or stiff-bristled brush to remove any loose rust and paintwork. It is important to note that not all rust should be removed, as rust must be present for the conversion process to occur.
Rust converters can be applied using a brush, roller, or spray. For smaller applications, a brush is recommended, while a roller is more suitable for larger surfaces. If spraying, an airless sprayer is preferred over a pump-up garden sprayer, as the solution is too thick for the latter. Apply the rust converter in thin coats, and if using a spray, apply 2-3 light coats with 15-minute intervals. After application, wait approximately 15 minutes, and you should see the rust turning into a blue-black colour, indicating successful conversion. If it doesn't change colour, reapply after 30 minutes.
Once the rust converter has cured, which can take 3 to 24 hours depending on ambient temperature, you can paint over it or apply a protective coating to seal the surface and prevent future rusting. An oil-based primer may be applied, but it is not required. However, if the surface is exposed to outdoor elements, it is recommended to apply two coats of a quality oil-based paint for added protection.
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Treat with a rust-killing product
There are several rust-killing products available that can be used to treat rust on metal auto floor pans. One popular option is POR-15, a rust-killing paint that can be applied directly to the affected area. It is important to note that POR-15 is activated by rust, so it is recommended to not remove all the rust before applying the product. After applying the first coat, a second coat should be applied when the paint is almost dry or slightly draggy to the touch. A third coat may also be necessary. It is important to wear gloves and long sleeves when working with POR-15, as it can be difficult to remove from the skin and other surfaces.
Another option for treating rust on metal auto floor pans is Rust Bullet, which is easier to apply than POR-15 as it does not require a pre-treatment. Simply remove as much rust as possible, clean the surface of loose material, and apply the Rust Bullet. It is important to use Rust Bullet in a well-ventilated area.
Other rust-killing products that can be used include Evapo-Rust, which can be handled safely with bare hands, and naval jelly, which can help remove a majority of the rust. After treating the rust with one of these products, it is typically recommended to apply a primer and paint to the affected area.
In addition to these chemical treatments, there are also mechanical methods for removing rust, such as using a wire brush, grinder, or sandblaster. These methods can be effective in removing loose rust and flaking paint, but they may not remove all the rust and can be time-consuming.
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Prime, fill, sand, and paint the metal
To repair rust on a metal auto floor pan, you will need to prime, fill, sand, and paint the metal. This process will vary depending on the extent of the rust damage and the tools available to you.
Firstly, you will need to remove the rust. This can be done by sanding or wire brushing the affected area. You can use a wire wheel on your power drill or an angle grinder for larger areas of rust. It is important to note that you may need to cut out sections of the floor pan with severe rust damage and weld in new sheet metal. If you do not have access to a welder, you can use a product like JBWeld under the new metal patches with pop rivets.
Once the rust has been removed, you will need to apply a primer to the metal. This will help to protect the metal from further corrosion and ensure proper paint adhesion. You can use a brush or spray primer for this step. Some recommended products include a 2K epoxy primer, POR-15, or a rust-inhibiting primer.
After the primer has dried, you can fill any holes or pockmarks in the metal with a filler. A two-part epoxy or fiberglass filler, such as Bondo auto body filler, is recommended for this step. Let the filler set, then sand it flat with a detail sander and sanding pad.
Finally, you can paint the metal. It is important to ensure that the surface is clean and free of any dust or debris before painting. You can use a product like POR-15 or Chassis Saver for this step.
It is important to note that this process may not permanently remove rust from the metal auto floor pan. Rust can reappear even after following these steps, and it may be necessary to repeat the process in the future. Additionally, it is recommended to wear protective gear, such as gloves and long sleeves, when working with chemicals and power tools.
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Frequently asked questions
First, remove the seats, carpets, and side panels to expose the floor pan. Then, use a wire brush or a wire wheel to remove loose rust and flaking paint. You can also use a cutting tool to cut out sections of the floor pan with severe rust. Next, clean the area with a degreaser and a sterilizing agent such as lacquer thinner, acetone, ketone, or wax. Finally, ensure the surface is completely dry before applying the rust treatment.
There are several products available for treating rust on metal auto floor pans. Some popular options include POR-15, Rust Bullet, Evapo-Rust, Ospho, and Rustoleum. When using POR-15, it is important to note that it is activated by rust, so it is recommended to leave a little rust on the surface for the product to cure effectively.
After preparing the surface and choosing the appropriate product, apply the rust treatment according to the manufacturer's instructions. For example, with POR-15, you should apply two to three coats of the product, allowing each coat to dry thoroughly before applying the next. Once the final coat is dry, you may need to sand the surface before applying a primer and paint to complete the restoration.
Yes, welding in new metal sections or using fiberglass repairs are alternative methods to treat rust on metal auto floor pans. Welding in new metal is considered the best method for a permanent repair, but it requires more specialized tools and skills. Fiberglass repairs can be effective for small holes, but they may not adhere well and can be more susceptible to rust in humid environments.
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