Chloe Zhang
Oxidation of plastics is a common issue, especially for plastic car parts, vinyl siding, and boats, which are exposed to the elements. Sunlight, heat, and air exposure can cause plastic to degrade and oxidize, resulting in a faded, discoloured, or chalky appearance. This process can be slowed by reducing the plastic's exposure to sunlight and oxygen. Fortunately, there are several ways to restore oxidized plastic to its original shine, including various polishing techniques, cleaning solutions, and the use of heat guns or gasoline.
How to Care for Oxidized Plastic
| Characteristics | Values |
|---|---|
| Cause of oxidation | Prolonged exposure to sun, heat, and other elements |
| Appearance of oxidation | Dull, discolored, faded, worn-out, chalky substance |
| Prevention | Store in an oxygen-free area, reduce exposure to sunlight |
| Restoration techniques | Sanding and buffing, soapy water and sandpaper, vinegar and water, detergent, household cleaner, bleach, heat gun, baking soda and water, specialized plastic cleaner, polishing compound |
| Items prone to oxidation | Car accessories, fiberglass boats, vinyl siding, vehicle exteriors, children's toys, storage containers |
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What You'll Learn
Use soapy water and sandpaper to restore hard plastic
Oxidation of plastics leads to degradation, causing an unpleasant appearance and the potential for more rapid degradation. Fortunately, many everyday plastic items can be restored at home via various polishing techniques and solutions.
For hard plastics that haven't been painted, you can use soapy water and sandpaper to restore them. First, fill a bucket with soap and water. Then, dip 150-grit sandpaper into the soapy water and rub the surface in a circular motion. Cover every faded area 5-6 times. Next, grab a sheet of 220-grit sandpaper and repeat the process, again rubbing in a circular motion. Cover every section 5-6 times before rinsing the surface off. You can continue using a finer grit sandpaper if there are any scratch marks remaining on the plastic.
Faded plastic that isn't discoloured is typically caused by oxidation. There are multiple ways to remove oxidation using a variety of different cleaning solutions. Choose the cleaning solution based on the type of plastic that is faded. Hard plastics that can use the soapy water and sandpaper method include storage bins, cutting boards, acrylic aquariums, and plastic furniture.
For vinyl plastic, mix five cups (1.2L) of distilled vinegar with one gallon (3.8L) of hot water. Mix the ingredients and pour them into a clean spray bottle. Take your plastic outside and hold the spray bottle 1-2 feet (0.30-0.61m) away from the vinyl. Spray it liberally and let it sit for 2-3 minutes. Then, rinse the plastic off with cold water and dry it with a cloth or paper towel. If the plastic is still faded, repeat the process, but this time scrub the mixture into the surface with a clean sponge.
For softer plastics, put on thick rubber gloves and protective goggles. Mix 1/3 cup (79ml) of liquid laundry detergent with 2/3 cup (160ml) of all-purpose household cleaner. Then, add one US quart (950ml) of bleach and one US gallon (3.8L) of water. Mix the ingredients and add them to a spray bottle. Take your plastic outside and spray the discoloured area. Let it soak for 2-3 minutes before rinsing the area with cold water. Wash your plastic thoroughly with soap and water after this process.
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Use a mixture of vinegar and water for vinyl plastic
Oxidation occurs when plastic is exposed to oxygen and moisture, leading to discoloration and white streaks. This process causes plastic to wear down and develop a rougher texture. Fortunately, there is a simple solution to restore your vinyl plastic items at home.
First, prepare a mixture of vinegar and water. For a stronger solution, mix five cups (1.2 litres) of distilled vinegar with one gallon (3.8 litres) of hot water. If you are cleaning coloured plastic, a gentler mixture of one-quarter gallon of warm water with one-quarter cup of vinegar is recommended to avoid fading or stripping the colour. Before applying the solution, always perform a spot test on an inconspicuous area to ensure the vinegar does not adversely affect the plastic.
Next, take your plastic item outside and pour the vinegar and water mixture into a clean spray bottle. Hold the bottle one to two feet away from the vinyl and spray liberally. Allow the solution to sit for two to three minutes. Then, rinse the plastic off with cold water and dry it with a cloth or paper towel. If the plastic is still faded, repeat the process, but instead of letting the solution sit, scrub it into the surface with a clean sponge.
For highly oxidised plastic, use a soft-bristled brush to gently scrub the surface in small sections. This will help remove the oxidation without allowing the solution to dry out. Finish by rinsing and drying the plastic as before.
By following these steps, you can effectively remove oxidation from vinyl plastic, restoring its original shine and appearance.
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Use detergent, cleaner, and bleach for softer plastics
Oxidation of plastic leads to degradation, causing plastic to wear down and develop a rougher texture. It can be caused by exposure to sunlight, air pollution, moisture, high temperatures, and biological exposure. You can remove oxidation in several ways, depending on the type of plastic. For softer plastics, a mixture of detergent, household cleaner, and bleach can be used.
First, put on thick rubber gloves and protective goggles for safety. Then, mix one-third of a cup of liquid laundry detergent with two-thirds of a cup of all-purpose household cleaner. Next, add one US quart of bleach and one US gallon of water. Mix the ingredients together and pour them into a spray bottle.
Take your plastic item outside and spray the discolored area. Allow the solution to soak for 2-3 minutes, then rinse the area with cold water. Finally, wash the plastic item thoroughly with soap and water to remove any detergent or bleach residue.
This method is suitable for softer plastics typically found in children's toys, malleable storage containers, and souvenirs. If the plastic is bendable or feels light, it is likely a softer plastic.
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Store plastics in an oxygen-free area
Oxygen is one of the leading causes of plastic degradation, so storing plastics in an oxygen-free environment is an effective way to prevent oxidation.
Oxygen-free storage is a practical solution for valuable items or museum pieces made of plastic. This method is especially useful for older plastics that do not contain stabilizing additives to protect against degradation.
To create an oxygen-free environment, you can use oxygen-absorbing products that seal the plastic. For example, you can use a mixture of five cups of vinegar and one gallon of hot water, applied with a spray bottle. This solution will create an oxygen-free seal on the plastic surface.
Another way to achieve an oxygen-free environment is through a process called pyrolysis. This method involves heating plastics in the absence of oxygen, converting them into valuable fuels and feedstocks. While this technique is primarily used for recycling non-recycled plastics, it demonstrates the effectiveness of oxygen deprivation in breaking down plastics.
By storing plastics in an oxygen-free area, you can significantly reduce the risk of oxidation and prolong the lifespan of your plastic items.
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Use a heat gun to restore faded plastic
Plastic oxidation is a common issue, especially for outdoor items exposed to sunlight, air pollution, moisture, and high temperatures. The good news is that you can restore oxidized plastic at home using various methods, including heat guns.
Using a heat gun on faded plastic is an effective way to restore its shine and colour. The process involves applying heat to the plastic's surface, causing the material to melt slightly and allowing the chemical bonds to realign as the polymers cool, resulting in a glossy finish. It is crucial to maintain a consistent distance of 4 to 6 inches between the heat gun and the plastic surface and to keep the gun in constant motion to avoid overheating and melting the plastic.
Before using a heat gun, ensure that you are working in a well-ventilated area and wearing the appropriate protective gear, such as gloves and goggles. The heat gun should be set to a high temperature, and you should maintain a distance of about 3 to 6 inches from the plastic surface. Slowly move the heat gun in a circular or concentric pattern around the faded area. You will notice the plastic beginning to "'sweat," and as you continue, the colour and shine should return.
While the heat gun method is effective, it is important to note that it is not a permanent solution. The restored plastic will eventually fade again, and repeated applications of heat will make the plastic more brittle and prone to cracking. Additionally, this method may not be suitable for all types of plastic, especially softer plastics. Always test the heat gun on a small, inconspicuous area first to ensure that it does not damage the plastic.
After treating the plastic with a heat gun, you can enhance the restoration process by applying a plastic restorer or protectant, such as Meguiar's Ultimate Black, to the warm surface. These products chemically adhere to the plastic, providing additional UV protection and extending the life of the restored plastic.
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