Sofia Martinez
Black plastic trim on vehicles is prone to fading and discolouration over time due to UV rays from the sun, causing the plastic to oxidize and turn a faded grey colour. To restore black plastic trim, it is important to first thoroughly clean the surface and remove any residue. This can be done using microfiber towels soaked in isopropyl alcohol or washing mitts soaked in alcohol for more stubborn dirt. Once the surface is clean and dry, there are several methods that can be used to restore the black colour and shine, including using a heat gun, applying olive oil or a black plastic trim moisturizer, or repainting or dyeing the trim. For light scratches and stains, polishing compounds or machines can be used to boost the blackness and gloss levels.
| Characteristics | Values |
|---|---|
| Reason for black plastic trim fading | UV rays |
| How UV rays affect the trim | UV light penetrates the trim material, causing the plastic to oxidize when exposed to oxygen |
| Effect of oxidation | Makes the car's plastic trims darken and become brittle |
| Other reasons for fading | Oils on the plastic trim's surface degrade and dry, making it look faded and gray |
| Cleaning the trim before restoring | Use microfiber towels soaked in isopropyl alcohol, then use washing mitts soaked in alcohol to remove stubborn dirt |
| Restoring the trim | Use a heat gun, olive oil, black plastic moisturizer, black spray paint, or a combination of adhesion promoter, paint, and clear coat |
| Protection | Use a trim restorer, or a layer of protection like Ceramic Spray Wax or Glisten Spray Wax |
| Polishing | Use a polishing machine with a 3" backing plate for the best results, or a soft pad and polish for a few passes |
| Polishing compounds | Use pure cutting compounds without glaze or wax, such as Sonax Cutmax |
| Removing scratches | Use Meguiars Ultimate Polish or Meguiars Ultimate Compound |
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What You'll Learn
Clean the surface with isopropyl alcohol and a microfiber towel
To achieve the best results when polishing black plastic trim, it is important to start with a clean surface. Using isopropyl alcohol and a microfiber towel is an effective way to remove any dirt, dust, or residue from the plastic trim. This step is crucial as it ensures that the polishing process will not push around or grind in any dirt particles, which could further scratch or damage the surface.
Isopropyl alcohol, also known as rubbing alcohol, is a powerful yet relatively gentle solvent that can effectively dissolve and remove a variety of substances, including oils, grease, and adhesives. When using isopropyl alcohol for cleaning, it is important to work in a well-ventilated area as the fumes can be strong. Wear protective gloves to avoid direct skin contact, and take care not to let the alcohol come into contact with sensitive surfaces or materials that may be damaged by its solvent properties.
Before applying the isopropyl alcohol, ensure that you have thoroughly inspected the surface and removed any large pieces of debris or caked-on substances. This can be done using a soft brush or a microfiber cloth. Once the surface is free of large particles, soak a microfiber towel with isopropyl alcohol. It is important to use a microfiber towel as it is gentle on surfaces yet highly effective at picking up and holding contaminants. The microfiber towel will help lift and trap dirt, dust, and residues, ensuring that they are not just smeared around on the surface.
Gently wipe down the entire surface with the alcohol-soaked microfiber towel, applying light pressure and working in small, circular motions. This will help remove any remaining dirt, oils, or residues that may be clinging to the plastic trim. Ensure that you wipe down all areas as thoroughly as possible. For more stubborn dirt or residue, you may need to use a washing mitt soaked in isopropyl alcohol, gently working it into the affected areas until the contaminants are lifted away.
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Use a pure cutting compound to remove scratches
Glossy black plastic trim is usually found in the B pillar section of cars between the front and back doors, but it can be found anywhere in a car. It scratches very easily, and swirl marks, acid etching, and other defects are not only easily inflicted but also more noticeable.
To remove scratches from black plastic trim, you can use a pure cutting compound. First, make sure to remove every bit of caked debris, dust, and other residues on the car trim. You can use microfiber towels soaked in isopropyl alcohol and washing mitts soaked in alcohol to remove stubborn dirt. Let the car trim dry. Then, tape up the rubber trim around the black plastic you are polishing to avoid scratches from the rubber particles.
Next, apply the pure cutting compound to the scratched surface using a medium pad. Your goal is to remove as many scratches as possible. You will likely see a haze on the plastic when you are done. If you don't see a haze, you are done. If you do see a haze, follow up with a finishing polish. Keep in mind that faster arm movements are a good way to keep heat down.
If you are dealing with deep scratches, it is easier to work on the scratches when the plastic panel has been removed from the car. If you cannot remove the panel, use automotive masking tape to cover and protect the materials around the plastic panel. First, use a razor to cut off any bits of plastic protruding from the scratched area. Then, sand down the scratches using sandpaper. After sanding, clean the surface with a damp cloth and spray your car interior cleaner onto a microfiber towel to remove debris, dirt, and grime. Finally, wipe off the dirt with a fresh microfiber towel.
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Apply a trim restorer or black plastic moisturiser
To restore black plastic trim, you can use a trim restorer or a black plastic moisturiser. Before applying any product, it is important to clean the plastic trim thoroughly. Use a microfiber towel soaked in isopropyl alcohol to remove any residue. If there is stubborn dirt, use washing mitts soaked in alcohol. Let the trim dry before applying any product.
You can use a trim restorer like Solution Finish Trim Restorer to restore black plastic trim. Apply the product with a microfiber or foam applicator. Wipe off any excess product with a clean towel and let the plastic dry for 6 hours. After the first application, the trim will stay black for approximately 8 months or more.
Black plastic moisturisers are another option to restore car trims by adding moisture to their surface. You can use olive oil or purchase a car trim moisturiser from an automotive store. Apply the moisturiser in the same way as olive oil.
It is important to note that some sources do not recommend using a heat gun or torch to melt the plastic trim as it can cause uneven shading and further damage the plastic.
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Use a heat gun to restore the plastic's natural oils
Using a heat gun to restore the plastic's natural oils is a well-known and proven method to restore black plastic trim on a car. This method involves using a heat gun to melt the plastic trim and remove degraded oils from the trim's material. However, it is important to note that torches can cause the trim's shade to become uneven, and excessive heat can cause melting or warping. Therefore, it is recommended to use low heat, keep the gun moving, and avoid prolonged exposure in one spot. Additionally, this method should only be used on thicker plastic parts and the heat gun should be held at least 5-10 cm away from the surface.
When plastic is exposed to oxygen and sunlight, it can oxidize, forming a whitish, chalky residue on the surface. This oxidation process diminishes the appearance and texture of the trim. Frequent washing can also strip natural oils from plastic, making it more vulnerable to damage. By using a heat gun, you can temporarily restore the color of the plastic by bringing the natural oils back to the surface. The heat from the gun opens up the cells and allows moisture to escape, and the natural oils are released, restoring the color.
It is important to note that the results of using a heat gun are short-lived, and the plastic will eventually fade again as the oils evaporate. Additionally, there is a risk of irreparable damage if the plastic is overheated. Therefore, it is crucial to be careful and only use a heat gun if you are experienced in handling one. There are alternative methods to restore faded plastic, such as using soapy water and sanding for mild fading, or plastic dyes or paints for deep discoloration.
To maximize the effectiveness of restoring black plastic trim, it is important to first remove all caked debris, dust, and other residues from the car trim. This can be done using microfiber towels soaked in isopropyl alcohol. Blocking off glass surfaces with taped paper scraps or other materials is also recommended before applying any treatment. Overall, while using a heat gun to restore the plastic's natural oils can be effective, it requires careful execution and is not a permanent solution.
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Finish with a UV-resistant trim shine
To finish with a UV-resistant trim shine, you can use a product like SHINE ARMOR Plastic Restorer, which provides UV protection and restores vinyl trim, rubber, and polypropylene. It also prevents drying and ageing, restoring dull plastic and degraded plastic without harsh chemicals.
Another option is to use a heat gun to melt the plastic trim and remove degraded oils, but this requires precision and caution to avoid damage. You can also use polyester paint or acrylic paint to restore the trim to its original colour.
Before applying any UV-resistant trim shine, it is important to clean the trim thoroughly to remove any dirt and residues. You can use a soft brush and a dedicated plastic cleaner to remove contaminants and avoid long-term damage. You should also dry the surface and lightly sand it to remove oxidation.
After applying the UV-resistant trim shine, gently buff the area to ensure a smooth, non-greasy finish. Allow the product to cure and bond for the specified time to ensure the trim is protected and maintained.
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Frequently asked questions
You can polish black plastic trim by hand or with a machine. To polish by hand, use a microfiber cloth and work in small circles. You can also use Meguiars Ultimate Polish to fill in scratches and boost gloss. If using a machine, a 3" backing plate will give the best results. Keep the pad moist and the speed down to avoid generating too much heat.
Black plastic trim can be restored by using a heat gun, olive oil, black plastic moisturizer, or black spray paint. Before applying any of these treatments, clean the surface with soap and water, and dry it with a towel.
Black plastic trim can be protected from fading by using a UV-resistant trim shine or a black plastic trim moisturizer.
