Leo Martínez
EDP coating, or electro-deposit primer, is a protective coating applied to steel replacement automotive panels to prevent rust during transport and storage. While EDP coating provides corrosion resistance, it is not recommended as the final coating on a panel. To achieve the best finish and long-term protection, it is necessary to apply a primer and paint over the EDP coating. There are different opinions on whether the EDP coating needs to be completely removed or simply scuffed before applying a primer and paint. Some sources recommend completely removing the EDP coating, especially if there is a risk of rust, while others suggest that scuffing the surface with sandpaper or a scuff pad is sufficient for better primer and paint adhesion. It is important to follow the manufacturer's recommendations for the specific primer being used, as some may require a clean surface without any sanding or scuffing, while others may suggest scuffing to improve adhesion.
Can I paint a base coat directly over EDP coating?
| Characteristics | Values |
|---|---|
| EDP coating removal | Not necessary but recommended in some cases |
| Scuffing/sanding EDP coating before applying base coat | Recommended by some sources, but not all |
| Primer before base coat | Recommended/necessary according to some sources |
| Rust | Can develop under EDP coating |
| EDP coating protection | Offers rust protection during transportation and until installation and painting |
| EDP coating application | Applied to steel replacement automotive panels |
| EDP coating thickness | Very thin |
| EDP coating colour | Black |
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What You'll Learn
Sanding and scuffing EDP coating
EDP coating, or electro-deposit primer, is a protective coating applied to steel replacement automotive panels. It protects panels from corrosion during transportation and storage and adds a layer of corrosion resistance after priming and painting.
Before painting or welding EDP-coated panels, it is essential to prepare the surface properly. While it is not necessary to completely remove the EDP coating, scuffing the coating with sandpaper or a scuff pad can improve the adhesion of primers and paint. This process creates an ideal surface for primer and paint to adhere to, enhancing the overall finish and corrosion resistance of the panel. It is recommended to use sandpaper in the 400-600 grit range or a maroon scuff pad for scuffing. This process is especially important for exterior surfaces that are exposed to the elements, as it helps prevent rust and ensures a smooth finish.
When welding EDP-coated panels, it is crucial to sand down the areas to bare metal to avoid any contamination in the welds. Similarly, if using an adhesive to bond EDP-coated panels, sanding the adhesive areas to bare metal ensures the strongest bond between the panels. It is important to note that scuffing or sanding the EDP coating may compromise its rust-inhibiting properties, so it is essential to follow the recommendations of the primer manufacturer. Some primers, such as those by Spies Hecker, advise against scuffing or sanding, while others recommend it for better adhesion.
After scuffing or sanding, it is essential to clean the panel with a surface cleaner, wax, and grease remover, or a neutralizing solution to ensure any residue is removed before applying the primer and paint. This step helps ensure that the primer and paint adhere properly and provides a smooth base for the subsequent layers.
Additionally, it is worth mentioning that lower-quality replacement panels may require more extensive sanding, priming, and prep work due to inadequate corrosion protection. Choosing high-quality EDP-coated panels can save time and effort in the long run, as they provide better corrosion resistance and require less preparation before installation.
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Using a primer over EDP coating
EDP coating, or Electrophoretically Deposited Paint coating, is a process used by manufacturers to ensure the longevity of steel replacement parts and body panels during transportation, storage, and shipment. It adds an extra layer of protection to the raw steel, helping to prevent rusting and corrosion.
When it comes to using a primer over EDP coating, there are a few things to consider. Firstly, it is generally recommended to scuff the EDP coating before applying a primer. This can be done with sandpaper or a scuff pad, creating a better surface for the primer to adhere to. However, some primer manufacturers, like Spies Hecker, recommend against scuffing as it can compromise the coating and destroy its rust-inhibiting properties. In these cases, it is advised to clean the surface with a wax and silicone remover before applying the primer.
It is important to note that EDP coating should not be the final coating on a panel. While it provides protection during transport and storage, a final coat of automotive primer and paint is necessary for long-term protection. When applying a primer over EDP coating, it is recommended to start by scuffing the surface, applying the primer, and then sanding before applying the final paint and clear coat layers.
In some cases, it may be necessary to remove the EDP coating completely before applying a primer, especially if welding is involved. This is because welding directly to the EDP coating can compromise the integrity of the weld. By sanding the areas to be welded down to the bare metal, you can ensure a strong bond and avoid contamination.
Additionally, if you are using an adhesive to bond an EDP-coated panel to another panel, it is recommended to sand the area where the adhesive will go down to the bare metal to ensure the strongest bond.
Overall, while it is possible to apply a primer over EDP coating, it is important to follow the specific recommendations of the primer manufacturer and take the necessary steps to ensure proper adhesion and protection.
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Painting directly over EDP coating
EDP, or electro-deposit primer, is a protective coating applied to steel replacement automotive panels. This primer protects your panels from rust during transport and storage and adds a layer of corrosion resistance after priming and painting.
While EDP coating offers rust protection, it should never be the final coating on a panel. Some sources suggest that it is possible to paint directly over EDP coating, but only after scuffing or sanding the surface. However, it is important to note that any sanding or scuffing of the E Coat compromises the coating and destroys its rust-inhibiting properties. Therefore, it is recommended to apply a primer before painting over EDP coating.
Before painting, it is crucial to determine whether the panel is truly coated with EDP. This can be done by using automotive-grade lacquer thinner. If the coating comes off on a rag, it is not EDP and will need to be sanded down to bare metal. If it is EDP, simply scuff it with a Scotch-Brite pad or sandpaper, creating an ideal surface for primer and paint adherence.
After scuffing or sanding, a primer should be applied. ZeroRust can be used as a primer and top-coated with automotive paint. Alternatively, an epoxy primer can be sprayed directly over the scuffed EDP coating. Once the primer is dry, the final paint and clear coat layers can be applied.
In conclusion, while it is possible to paint directly over EDP coating after scuffing or sanding, it is recommended to apply a primer first to ensure proper adhesion and maintain the rust-inhibiting properties of the EDP coating.
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Removing EDP coating
EDP coating, or Electro-Deposit Primer, is a protective coating applied to steel replacement automotive panels to protect them during transport and storage and to add a layer of corrosion resistance after priming and painting.
While it is not necessary to remove the EDP coating completely, it is important to prepare the surface before applying a primer and paint. This can be done by scuffing or sanding the coating. Some sources recommend using a red 3M Scotchbrite pad for scuffing, as it provides enough abrasion for adhesion without breaking through on edges like sandpaper. However, it is important to note that sanding or scuffing the coating may compromise its integrity and destroy its rust-inhibiting properties.
If you choose to remove the EDP coating completely, there are a few methods you can use. One method is to use a chemical stripper, as seen on some TV car shows. You can also try using a rag soaked in lacquer thinner and letting it sit for a while. If the coating doesn't come off, you may need to use a DA sander with 80-grit sandpaper to remove it. This will ensure you have a clean metal surface for the application of your primer and paint.
Once the EDP coating is removed or prepared, you can apply a primer and paint of your choice. It is recommended to use an automotive-grade primer and paint specifically designed for use with metal surfaces. Follow the manufacturer's instructions for proper application and allow adequate drying time between coats.
Additionally, if you are welding or using adhesives to bond EDP-coated panels, it is essential to sand the areas down to the bare metal to ensure a strong bond and avoid contamination.
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EDP coating and rust
EDP coating, or Electrophoretically Deposited Paint coating, is a process used by manufacturers to ensure the longevity of steel replacement parts and body panels during transportation, storage, and shipment. It adds an extra layer above the raw steel to prevent rusting and corrosion.
EDP coating is not meant to be the final coating on a panel. While it does protect the panel from rust, if left outside for extended periods, especially in humid conditions, the panel will start to rust. It is recommended that you scuff the EDP coating before applying a primer and paint. However, some sources suggest that sanding or scuffing the E Coat before applying a primer can compromise the coating and destroy its rust-inhibiting properties. In these cases, it is recommended to clean the surface with a wax and silicone remover before applying the primer.
If you are planning to weld the panel, it is recommended to sand down the areas to be welded to bare metal to ensure the strongest bond.
You can use automotive-grade paints with EDP-coated replacement panels. The sanding, priming, and final spraying steps are the same as with any automotive painting process.
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Frequently asked questions
No, you should not paint directly onto an EDP coating. You must first apply a primer.
EDP, or electro-deposit primer, is a protective coating applied to steel replacement automotive panels. It protects panels during transport and storage and adds a layer of corrosion resistance after priming and painting.
You can prepare the EDP coating by scuffing it with sandpaper, a scuff pad, or a Scotchbrite pad. However, some sources suggest that sanding or scuffing the E Coat may compromise the coating and destroy its rust-inhibiting properties.
You can use a 2K urethane primer or an epoxy primer.
