Ethan Clarke
Plastic body panels can be repaired using fillers, but this was never intended to be more than a surface-level solution. For a more permanent fix, you can use a hammer and dolly to work out the damage. This requires carefully tapping the highest spots and working the hammer and dolly across the panel to smooth out the damage. It's important to note that brute force is not the answer, and taking the time to plan your approach can help you avoid causing more damage.
| Characteristics | Values |
|---|---|
| Materials | Hammer, dolly, filler, flexible spreader, sandpaper |
| Steps | Identify the original point of impact, hammer out the bulged area, then the dented area, use filler to cover imperfections |
| Considerations | Age of the vehicle, avoid using brute force, work out concave areas |
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What You'll Learn
Use a hammer and dolly to work out the damage
Using a hammer and dolly to straighten plastic body panels is a delicate process that requires a keen eye, a steady hand, and a feel for the imperfections in the panel. Before starting, it is important to choose the right tools for the job. A basic body hammer set includes a round head for smoothing and a pick side called a strawberry crown for working on small dents. For larger or smaller dents, a bumping hammer or finishing hammer may be more appropriate.
The dolly is a backup device used to support the metal behind the hammer. It is important to choose a dolly that matches the contour of the panel. If the dolly has a lower crown or is flatter than the panel, it will flatten out the panel. If it has too much crown, it can stretch the metal and create high spots. The dolly should match the crown or curve of the panel as closely as possible, erring on the high side.
To begin the process of working out the damage, start at the edge of the panel and hold the dolly beneath the lowest spot. Then, start tapping on the highest spot close to the dolly with the hammer. As you hammer, you should see the high spot moving down and the metal above the dolly rising. Continue to move the hammer and dolly so they are working on the areas that are most out of shape. As some areas improve, move on to the next worst area and continue this approach until the panel is completely smooth, or as close to smooth as you are able to get it.
It is important to note that this process takes time and patience. Light taps with the hammer are better than big hits, and it is a gradual process of working out the damage. With practice and patience, it is possible to achieve satisfactory results in straightening plastic body panels with a hammer and dolly.
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Use body filler to smooth the panel
Plastic body filler can be used to smooth a plastic panel. This method can be used to fill pits or small defects in the plastic. Firstly, it is important to determine the original point of impact on the panel. This is because there are two areas of damage to any panel involved in a collision: the damage from the actual impact and the damage that occurs from reaction forces.
Next, use a flexible spreader to carefully apply the filler to any low spots. Be careful to prevent air bubbles from forming. The filler should not be applied at more than 1/8 inch thick at its deepest point. After the filler hardens, it can be sanded and shaped, starting with 80-grit sandpaper.
Deeper dents will require more layers of filler. If you are able to metal finish the panel without using any filler, the repaired area should be left slightly lower than the surrounding area to prevent the body filler from building up.
There are different types of fillers available, such as fiber-reinforced, metal-reinforced, and polyester glazing putty. The type of filler used depends on the specific requirements of the job. For example, fiber-reinforced filler is used when added strength is required, while metal-reinforced fillers are used for restoration work or where lead was initially used.
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Assess the original point of impact
When repairing plastic body panels, it is important to assess the original point of impact to understand the extent of the damage and the best approach to straightening the panel. Here are some key considerations when assessing the original point of impact:
Identify the Impact Area
Begin by examining the damaged panel to identify the area that suffered the initial impact. This can be tricky, especially if there are multiple dents or if the panel has been damaged from both the impact and reaction forces. Look for signs of direct contact, such as scratches or paint transfer, which can indicate the point of impact.
Inspect for Reaction Forces
Reaction forces can cause damage to areas beyond the initial impact point. For example, if a door is impacted in the middle, the force may cause the panel to separate from its mounting points, resulting in additional damage. Inspect the panel for signs of deformation or separation, which can indicate the presence of reaction forces.
Assess the Damage Type
Determine the type of damage caused by the impact. Common types include dents, scratches, and bulges. Dents may require hammering or the use of a slide hammer to pull out the dent and return the panel to its original position. Bulges, on the other hand, can be caused by dents in another area of the panel, and should be addressed first to prevent stretching when straightening the actual dent.
Evaluate Panel Condition
Consider the condition of the panel before the impact. Was it previously damaged or repaired? Older vehicles often have thicker sheet metal, requiring more effort to straighten when compared to modern vehicles with thinner, more flexible panels. Understanding the original condition can help set expectations for the repair process and the potential outcome.
Determine Repair Approach
Based on the assessment of the point of impact and the resulting damage, determine the appropriate repair approach. Minor dents may only require hammering, while deeper dents might need additional layers of filler. If the damage is beyond your skill level or the panel is severely damaged, consider seeking professional assistance or replacing the panel entirely.
Assessing the original point of impact is crucial to effectively straighten plastic body panels. By understanding the impact location, the forces involved, and the resulting damage, you can develop a targeted repair strategy to restore the panel to its original shape as closely as possible.
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$15.5 $19.99
Sand and shape the filler
Sanding and shaping the filler is a crucial step in straightening plastic body panels. Here's a comprehensive guide to help you achieve the desired results:
Prepare the Filler
Before you begin sanding, it's essential to ensure that the filler is properly mixed and applied. Start by mixing the body filler with the appropriate hardener, following the manufacturer's instructions, to achieve a smooth and streak-free consistency. Apply the filler to the repair area, ensuring it's slightly higher than the surrounding metal to allow for sanding. Use multiple thin layers if needed, as a single thick layer may sag or crack.
Initial Sanding
Once the filler has hardened, you can begin sanding. Start with 80-grit sandpaper to level the surface. If you're working on a curved surface, you can hand-hold the sandpaper, being careful to maintain the correct contours. For flat surfaces, use a sanding block to prevent waves in the finish. When using a sanding block, sand in straight lines and change directions regularly to avoid creating low spots or grooves. Avoid sanding in a circular motion, as this can remove filler too quickly.
Refining the Shape
After the initial sanding with 80-grit sandpaper, step up to 120-grit paper. Continue refining the shape by progressing to even finer grits, such as 220-grit. Run your fingers over the repair area to feel for any imperfections. Keep sanding until the entire repair feels and looks perfect. You can use a brush to remove sanding dust from the pockets in the filler between coats.
Final Shaping
For the final shaping, switch to a finer grade of abrasive paper, such as 180-280 grit. Continue to sand in straight lines, changing directions to achieve an even finish. This step requires patience and practice to get perfect. If you encounter small pinholes or low spots, use a "stopper," a very fine filler, to fill them in.
Priming
After all the filler has been applied and shaped, it's time to apply a coat of high-build primer. This will help create a smooth base for the final paint job. Allow the primer to dry thoroughly before proceeding to the next step.
Remember, when working with fillers and sandpaper, always wear the appropriate safety gear, including gloves, eye protection, and a respirator to avoid inhaling dust.
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Use a push with a hydraulic ram
Using a push with a hydraulic ram is a great method to straighten plastic body panels. This method is preferred over hammering and pounding, which can cause more damage to the metal than the initial dent. To straighten a dent in a plastic body panel, set up a push using a four-ton hydraulic ram with a 1/4-inch slab of rubber on the inner surface of the dent. Place a 2x4 block for the ram head to push against. This setup provides the necessary control to push out the dent without causing further damage.
The hydraulic ram setup allows for precise and controlled force application, ensuring that the dent is removed slowly and carefully. It is important to proceed slowly when using a hydraulic ram to straighten a plastic body panel. By taking your time, you can monitor the progress and make adjustments as needed. This method is a safer alternative to using brute force, which can lead to additional damage and lengthen the time required for repairs.
When using the hydraulic ram, ensure that the slab of rubber is positioned correctly on the inner surface of the dent. This rubber acts as a protective layer, preventing direct contact between the ram and the plastic body panel. The rubber helps distribute the force evenly, reducing the risk of creating new dents or damaging the surrounding areas.
Additionally, the 2x4 block placed in front of the ram head serves as a sturdy surface for the ram to push against. This block should be securely positioned to withstand the force applied by the hydraulic ram. By using the hydraulic ram with the appropriate accessories, such as the rubber slab and the blocking wood, you can effectively straighten the plastic body panel while minimizing the risk of further damage.
Using a hydraulic ram with the right accessories and techniques can make repairing plastic body panels more efficient and controlled. This method showcases how, with the right tools and knowledge, you can achieve successful repairs without resorting to brute force or causing additional damage to the vehicle.
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Frequently asked questions
Basic tools for bodywork include a hammer, a dinging spoon or a smooth-faced body hammer, a flexible spreader, filler, and sandpaper.
The first step is to determine the original point of impact. Identify the two areas of damage to the panel: the damage suffered from the actual impact and the damage that occurred from reaction forces.
The "off-dolly" technique involves holding the dolly beneath the lowest spot and tapping on the highest spot close to the dolly. Keep moving the hammer and dolly to work out the most uneven areas.
You can hire an auto body shop to take care of the collision repair for you. However, this may be costly and time-consuming.
