Maya Ellison
Plastic bumpers can be easily damaged during shipping, but there are several ways to straighten them without having to replace the entire bumper. This can be done by applying heat to the plastic bumper, which makes it more pliable and easier to reform. This can be done using a heat gun, a hairdryer, or by simply leaving the bumper in direct sunlight. Once the plastic is warm, the dent can be pushed out manually, either from the back or by using a wooden block and a wet cloth to hold the shape of the bumper as it cools. For more extensive repairs, such as cracks and tears, the process becomes more complex and may involve grinding, sanding, sculpting, and painting.
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What You'll Learn
Heat the bumper with a hairdryer or heat gun
To straighten a plastic bumper after shipping, one method is to use a hairdryer or heat gun to heat the plastic, making it more malleable. This is a simple process, but it should be done with caution to avoid damaging the bumper.
If using a hairdryer, set it to its highest heat setting and hold it around 6 inches away from the dent. Move the dryer back and forth over the dent for 2-3 minutes, ensuring you sweep in a continuous motion to heat the area evenly.
If the dent is particularly stubborn, a heat gun can be used to reach higher temperatures. However, heat guns should be treated with caution as they can easily damage the paint or plastic if held too close or left on the bumper for too long. Keep the heat gun around 1 foot (12 inches) away from the bumper, and never move it closer than 5 inches. Sweep the heat gun slowly back and forth to distribute the heat evenly. Once the plastic is visibly heated, stop heating immediately.
After heating the plastic, you can try to push out the dent manually. It is important to work quickly, as the plastic will begin to cool and set into its previous position after a couple of minutes. It is recommended to wear heat-resistant gloves to protect your hands, and some sources also suggest wearing goggles for safety.
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Push out the dent from behind
If you can get your hand behind the dent, you may be able to push hard enough to pop the dent out. For example, on a Honda, the seam can be snapped open, allowing you to stick your hand behind the dent. If the plastic bumper is fairly thin and the damage is not bad, you can try this method.
If the dent is particularly sharp, or you need to recreate body lines, a block of wood or the handle of a utility knife may be the best tool to push out the dent. It is best to start at the outer area of the dent and work your way in towards the deepest part.
If the dent is large, the palm of a gloved hand may be the best tool to use. Popping the dent sometimes requires straight, steady pressure, while other times firm lateral movement with a tool will work best.
If the plastic is thick, you may need to heat the plastic bumper with a hairdryer. Turn the dryer to the high, hot setting, and blow-dry the dented area in a continuous sweeping motion for about three minutes. Then, try to push the dent out manually, using heat-resistant gloves to protect your hands.
A heat gun can also be used to heat the plastic, but it will be much more powerful than a hairdryer, so care must be taken not to damage the plastic. Keep the heat gun around one foot away from the plastic bumper and never move it closer than 5 inches. Once the dented region is hot enough, invert the dent with a wooden block from the inside of the bumper cover and hold the outside with a wet cloth. Keep your hands on either side of the bumper for a few minutes, holding the bumper's shape in place.
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Sand the area by hand
Sanding the area by hand is a crucial step in repairing a plastic bumper. It is important to start with the appropriate grit paper and work your way up to achieve a smooth finish. Here is a step-by-step guide:
Scuff the Damaged Area: Before you begin sanding, it is essential to scuff the damaged area slightly. This helps create a rough surface that will allow the repair products to adhere better. You should also clean the area with a plastic surface cleaner, ensuring that you scrub both the inner and outer surfaces if the bumper is completely torn through.
Sand with 80-Grit Paper: Once the surface is dry, you can start sanding by hand using 80-grit paper. This initial sanding step helps remove any remaining residue and creates a uniform surface. It is important to sand in a single direction to achieve consistent results.
Form a "V" Groove: After sanding with 80-grit paper, you will need to form a "V" groove in the damaged area on both the front and back sides of the bumper. This step helps in creating a smooth transition when repairing the damage.
Sand with Finer Grit: Depending on the severity of the damage and the desired smoothness, you may need to progress to finer grits. You can continue sanding by hand with 180-grit, 240-grit, 320-grit, and even up to 400-grit paper. Always remember to sand gently and avoid using too coarse a grit, as it can leave plastic fuzzies on the surface.
Smooth the Surface: The goal of sanding by hand is to achieve a smooth and uniform surface. Take your time with each grit, ensuring that you remove any imperfections and create an even finish. It is crucial to work your way up to finer grits gradually to avoid over-sanding and exposing the bare plastic.
By following these steps and working patiently, you can effectively sand the plastic bumper by hand, creating a smooth and consistent surface that is ready for the next steps in the repair process.
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Use a plastic welding kit to repair cracks
If your plastic bumper has cracks, you can use a plastic welding kit to repair them. This process involves melting plastic to fuse the crack together. Here is a step-by-step guide on how to do it:
First, identify the type of plastic in your bumper. Look for a stamp on the inside of your bumper that labels it as PP, PPO, TPE, PUR, or TPUR. This is important because different types of plastic require different repair products. Consult with an expert at an auto parts store to determine the right products for your bumper's plastic.
Next, prepare the damaged area. Slightly scuff the area and clean it with a plastic surface cleaner. If the bumper is completely torn through, scrub both the inner and outer surfaces. Rinse and let the surface dry before wiping the area with a prep solvent. Move your hand in only one direction while doing this. Once the solvent has dried, sand the area by hand with 80-grit paper.
Now you can begin the welding process. Plastic welding kits typically come with instructions, so follow those closely. The basic idea is to use a heat source, such as a soldering iron, to melt plastic and fuse the crack together. You may also use plastic welding rods, which are heated and applied to the crack to form a bond.
After the repair is complete, you will need to refinish the welded area. Apply two wet coats of flexible part sealer and let it dry for about 30 minutes. Then, prime and paint the area. Apply two coats of a two-part primer-surfacer, letting it dry between coats. Once the primer has hardened, dry sand the repaired areas with 400-grit paper to smooth it out and remove any imperfections.
Finally, you can spray the bumper with basecoat according to the manufacturer's instructions. You may need to repeat this process a few times to get complete coverage. Once the basecoat is dry, mix the clearcoat with a hardener and apply two medium clearcoats, allowing each to dry in between.
Using a plastic welding kit to repair cracks in a plastic bumper is a cost-effective way to fix your bumper and restore its appearance. It is important to follow safety precautions when working with high temperatures and always work in a warm, dry place to ensure the repair adhesives cure properly.
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Clean the bumper with soap and water
To straighten a plastic bumper after shipping, one of the first steps is to clean the bumper with soap and water. This is a good way to identify any hidden damage and prepare the plastic bumper for the next steps of the repair.
First, mix some warm water with soap. Dish soap works best for this. Use a sponge to thoroughly wash the bumper, making sure to get into all the nooks and crannies. Rinse the soap off with clean water. Dry the bumper with a microfiber detail cloth, or a soft towel, making sure to get into the crevices near the metal ring.
It's important to clean the bumper thoroughly, as any remaining dirt or grime can interfere with the repair process. A clean bumper will also help any subsequent steps be faster and easier, ensuring a complete and professional repair.
Once the bumper is clean, you can move on to the next steps, which may include heating and reshaping the bumper, sanding, and painting.
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Frequently asked questions
If your plastic bumper has a small bend, you can try to heat the plastic to make it pliable and then reform its shape. You can use a hairdryer, a heat gun, or a heat lamp to heat the plastic, but be careful not to overheat it and always take the necessary precautions to protect yourself. Once the plastic is warm, try to push out the dent from the back. You can also use a plastic welding kit to repair any cracks.
First, identify the type of plastic in your bumper, which will be labelled as PP, PPO, TPE, PUR, or TPUR. Then, clean the repair area with soap and water, followed by a plastic surface cleaner. Next, sand the area by hand and form a "'V' groove in the damaged area on the front and back sides of the fascia." Apply a flexible filler, sand again, and then prime and paint the bumper.
If the dent is small and the plastic is fairly thin, you can try to invert the damage with your hand. If that doesn't work, use a hairdryer or heat gun to heat the plastic and then try to push out the dent manually while wearing heat-resistant gloves.
