Lena Rivera
EDP coating, or Electrophoretically Deposited Paint coating, is a process used to protect steel replacement parts and body panels from corrosion during transportation, storage, and shipment. To prepare EDP coating for painting, it is recommended to start by scuffing the coating with sandpaper or a scuff pad to ensure proper primer and paint adherence. This is followed by sanding down the areas to be welded to bare metal, which helps eliminate impurities and ensures the strongest bond. After welding, the surface is prepped with a surface cleaner, primer, and then paint.
Characteristics and Values of prepping EDP coating for painting:
| Characteristics | Values |
|---|---|
| Purpose of EDP coating | Corrosion protection, longevity |
| Pretreatment | Metal cleaning, phosphate application |
| Welding | Sand down to bare metal, avoid welding directly to EDP coating |
| Surface preparation | Scuffing, Sanding, Cleaning |
| Primer and paint | Use automotive primer and paint, ensure proper adhesion |
| Top coating | Scuff the surface, apply primer and paint layers |
| Removal | Not necessary, but can be removed with sanding |
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What You'll Learn
- Scuff the coating with sandpaper or a scuff pad to ensure proper primer and paint adherence
- Clean the metal with a surface cleaner before painting
- Apply a conversion coating and a tack rag after sanding
- Welded areas should be sanded down to bare metal to eliminate impurities and get the strongest bond
- Wet sand and recoat if the body only needs light work
Scuff the coating with sandpaper or a scuff pad to ensure proper primer and paint adherence
When preparing EDP-coated panels for painting, it is important to scuff the coating to ensure proper primer and paint adhesion. This can be done using sandpaper or a scuff pad. Here are some detailed steps to guide you through the process:
Firstly, it is important to choose the right sandpaper grit for the job. For scuff sanding, a medium to fine grit sandpaper is typically recommended. This ranges from 100 to 220 grit for most surfaces like drywall. If you are working with wood, a medium grit of 100 to 150 is suitable for opening the grain, while a finer grit of 180 to 220+ is ideal for smoothing the surface between coats of paint. For metal surfaces, a medium grit is also appropriate for dulling a previously painted surface, and a finer grit can be used for the final sanding pass. It is important to avoid using a grit that is too high to prevent losing adhesion.
Before you begin scuffing, ensure that the surface is clean, dry, and dull. Clean the surface with a surface cleaner or a tack cloth to remove any dust or debris. Allow the surface to dry completely before proceeding.
Once the surface is prepared, you can start scuffing the coating. Use your chosen sandpaper or scuff pad to lightly sand all the surfaces that will be painted. This process will create a rough texture on the coating, improving the adhesion of the primer and paint. Remember to be gentle and avoid applying too much pressure, as the goal is to create a slightly rough surface without damaging the underlying material.
After scuffing, it is important to remove any residual dust created during the process. Use a vacuum extractor to remove the majority of the dust, then follow up with a tack cloth or a clean microfiber cloth to wipe down the surface. Finally, use a small blower to eliminate any remaining lint or dust particles.
By following these steps and properly scuffing the EDP coating, you will achieve better adhesion for your primer and paint layers. This process ensures a smooth and durable finish for your project.
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Clean the metal with a surface cleaner before painting
EDP coating, or electrodeposition coating, is a method of painting that uses electrical currents to deposit paint on a surface. Before applying an EDP coating, it is important to clean the metal surface and apply a phosphate to prepare it for the E-coat.
Cleaning the metal surface before painting is crucial to ensure the paint adheres properly and to achieve a professional finish. The surface should be free from dirt, oil, grease, grime, and rust, as these can interfere with the paint's adhesion, resulting in streaks or chips.
To clean the metal before painting, start by using a surface cleaner. You can use a product specifically designed for this purpose, such as a prep sol product or a degreaser. Cheap thinner, also known as Gunwash, is an affordable option for removing heavy grease buildup. For lighter grease and general cleaning, laundry detergent works well and can be applied with a rag or a power washer. If there is rust on the metal, use a rust remover to clear it before proceeding.
After cleaning, it is important to avoid touching the surface with your fingers, as this can transfer grease or oil. The next step is to scuff the surface with sandpaper or a scuff pad to further improve paint adhesion. Finally, you can apply a self-etching primer to create an ideal base for the paint to bond to the metal.
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Apply a conversion coating and a tack rag after sanding
To prepare EDP-coated panels for painting, you must first sand the EDP coating off the external panels. Then, you can begin the process of prepping the surface for a Direct-to-Metal (DTM) epoxy primer.
The first step is to wipe the surface with a cleaner, followed by a conversion coating, and finally, a tack rag. A conversion coating is a chemical or electrochemical treatment that superficially converts the material into a thin, adhering coating of an insoluble compound. It is commonly applied to protect the surface against corrosion, improve the adherence of other coatings, for lubrication, or for aesthetic purposes. There are three main types of conversion coatings: oxide coatings, phosphate coatings, and chromate coatings. Oxide coatings are anti-corrosion products that are ultra-thin and offer good adhesion. Phosphate coatings are highly adhesive and are produced by the chemical conversion that exists on a metal substrate. Chromate coatings are similar to phosphate coatings and are also created by chemical conversion.
After applying the conversion coating, you can use a tack rag to remove any remaining loose particles of dust, dirt, and lint that could contaminate the surface to be painted. A tack rag, also known as a tack cloth, is a specialized type of wiping cloth that is treated with a tacky material, typically a resinous material that is often a petroleum derivative. The tack cloth is designed to remove any remaining fine dust particles from the surface. It is important to note that the surface should be relatively clean before using a tack cloth, as it is not meant to be used as a scrub cloth for main cleaning chores.
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Welded areas should be sanded down to bare metal to eliminate impurities and get the strongest bond
When preparing EDP-coated panels for painting, it is important to note that EDP coatings are not intended to be the final coating on a panel. To ensure proper adhesion of the primer and paint, the surface must be prepared adequately.
For welded areas, it is crucial to sand down the EDP coating to bare metal. This process eliminates impurities and ensures the strongest bond between the welded metals. By removing the coating, you are creating a clean and pure surface for the welds, which is essential for achieving optimal results.
The recommended practice is to use sandpaper or a scuff pad to strip the EDP coating completely from the welded areas. This step guarantees that any contaminants or impurities are removed, allowing for a stronger and more reliable weld. It is worth noting that some welders may be hot enough to burn off the coating during the welding process. However, it is always best to start with a clean metal surface to ensure the highest quality welds.
Additionally, for areas that are difficult to reach, it is not necessary to remove the EDP coating entirely. In these cases, you can simply scuff the surface to increase adhesion for the primer and paint layers. This scuffing process creates a rough surface that enhances the bonding of the subsequent layers. Remember, the goal is to achieve a strong and durable finish, and proper preparation of the welded areas is crucial to ensure the best results.
By following these steps and paying close attention to the welded areas, you can ensure that your EDP-coated panels are properly prepared for painting. This process will result in a high-quality and long-lasting finish, protecting your panels from corrosion and maintaining their aesthetic appeal.
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Wet sand and recoat if the body only needs light work
If the body only needs light work, you can wet sand and recoat. Wet sanding is a finishing process that helps to improve the quality of a paint job. It is often used after dry sanding to remove the scratches left by the dry sanding process.
To wet sand, you will need waterproof sandpaper that is specifically rated for wet sanding. The sandpaper should be soaked in water overnight before use. When using the sandpaper, it is important to use light, linear movements and alternate directions between passes. This will help to remove scratches and create a smooth, even finish. You can also add a bit of detergent to the water to reduce water tension and prevent scratches.
In addition to the sandpaper, you will need a backing pad to achieve a uniform finish. The backing pad will also help to prevent the sandpaper from folding back on itself and create a smoother finish than using your hands alone.
Wet sanding is a great way to improve the finish of a paint job and can be used to refine the surface and achieve a desirable finish. However, it is important to note that wet sanding only removes surface scratches and not much material, so it is important to use a light touch.
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Frequently asked questions
EDP or Electrophoretically Deposited Paint coating is a process used by manufacturers that helps ensure the longevity of steel replacement parts and body panels. EDP coatings add additional layers above the raw steel to help prevent rusting and corrosion.
To prepare EDP coating for painting, you can simply scuff the surface with sandpaper or a scuff pad and then apply a primer. This will increase the adhesion of your final paint layers. There is no need to completely remove the EDP coating.
The first step in the process of applying EDP coating is pretreatment, where metal is cleaned and a phosphate coating is applied to prepare the surface for the E-coat. This step is crucial for achieving the desired performance requirements.
No, it is not recommended to weld directly to an EDP coating. The areas to be welded should be sanded down to bare metal to ensure the strongest bond between the metals and to eliminate any possible contaminants.
