Chloe Zhang
Faded plastic is a common issue, often caused by oxidation, sun exposure, or dirt build-up. Fortunately, there are several methods to restore discoloured plastic and revive its original colour. The chosen method depends on the type of plastic and the extent of the fading. For instance, a diluted mix of bleach, mild detergent, and water can effectively clean and brighten soft outdoor plastics like chairs and toys. However, bleach may alter the original colour of the plastic, so caution is advised. Painting the plastic can also be an effective solution, especially for items that have been painted in the past. This process involves using a spray primer designed for plastic, followed by a layer of spray paint made for plastic. Another option is to use a heat gun on its lowest setting, moving it back and forth a few inches away from the plastic, which can restore colour by melting away the discoloured layer.
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What You'll Learn
- Use a heat gun on its lowest setting to melt away discolouration
- Remove oxidation with sandpaper, vinegar, or a diluted bleach solution
- Use linseed oil and mineral spirits to rejuvenate plastic
- Paint plastic with spray paint designed for plastic
- Apply a UV-resistant sealant to protect plastic from sun damage
Use a heat gun on its lowest setting to melt away discolouration
Using a heat gun to restore the colour of plastic can be an effective method, but it requires careful application to avoid damaging the plastic. The heat from the gun can melt away the discoloured layer on the plastic, but excessive heat can also warp or melt the plastic, so it is important to keep the heat gun on its lowest setting.
Before using a heat gun, it is important to prepare the plastic surface. Begin by thoroughly cleaning the plastic with soap and water to remove any dirt, grease, or residue that could interfere with the heat treatment. If the plastic is painted, it is recommended to remove the paint before applying heat, as the paint may discolour or peel off. Old coatings, such as paint or other finishes, should also be removed.
Once the plastic is clean and free of any coatings, you can start applying heat with the gun. Keep the heat gun 4-6 inches (10-15 cm) away from the plastic surface to prevent overheating and maintain proper distance. Move the heat gun slowly in a circular motion across the surface, avoiding staying in one spot for too long to prevent discolouration or damage.
As you apply heat, you will notice the colour of the plastic starting to deepen. Continue heating until the plastic returns to its original colour, then move on to the next section. Stop heating once you have achieved the desired result.
After you have finished applying heat, allow the plastic to cool completely before touching it or applying any products. For additional protection and shine, you can apply a plastic restorer after the plastic has cooled. This step will help seal the surface and protect it from future fading.
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Remove oxidation with sandpaper, vinegar, or a diluted bleach solution
Oxidation is one of the main reasons for the fading and degradation of plastic items. It causes the plastic to wear down and develop a rougher texture. Fortunately, you can easily remove oxidation with sandpaper, vinegar, or a diluted bleach solution.
Sandpaper
Sandpaper can be used to remove oxidation from hard plastics such as storage bins, cutting boards, acrylic aquariums, and plastic furniture. First, fill a bucket with soapy water and dip 150-grit sandpaper into it. Then, rub the surface of the plastic in a circular motion, covering every faded area 5-6 times. Next, repeat the process with a sheet of 220-grit sandpaper. Finally, rinse the surface off with water. If there are any scratch marks remaining on the plastic, you can use a finer grit sandpaper to remove them.
Vinegar
A mixture of vinegar and water can be used to remove oxidation from vinyl plastic. To make the mixture, mix 5 cups (1.2 L) of distilled vinegar with 1 gallon (3.8 L) of hot water. Pour the mixture into a clean spray bottle and take your plastic item outside. Hold the spray bottle 1-2 feet (0.30-0.61 m) away from the vinyl and spray it liberally. Let the mixture 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, you can repeat the process or scrub the mixture into the surface with a clean sponge.
Diluted Bleach Solution
A diluted bleach solution can be used to remove oxidation from softer plastics. First, put on thick rubber gloves and protective goggles. Then, mix 1/3 cup (79 mL) of liquid laundry detergent with 2/3 cup (160 mL) of all-purpose household cleaner. Add 1 quart (950 mL) of bleach and 1 gallon (3.8 L) of water to the mixture. Pour the mixture into a spray bottle and take it outside, along with the plastic item. Spray the discolored area and let it soak for 2-3 minutes before rinsing the area with cold water. Finally, wash the plastic thoroughly with soap and water to remove any detergent or bleach residue.
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Use linseed oil and mineral spirits to rejuvenate plastic
If you want to restore the colour of faded plastic, there are several methods you can try. One of the most effective ways to protect plastic from sun damage and lock in colour is to apply a UV-resistant sealant. However, if you specifically want to use linseed oil and mineral spirits to rejuvenate plastic, here is a step-by-step guide:
First, prepare a 60-40 blend of boiled linseed oil and low-odour mineral spirits (paint thinner). This mixture should then be rubbed onto the faded plastic with a rag. After about a minute, use another rag to buff the solution off. The colour of the plastic should be restored, and the finish should be smooth and polished.
This method was found to be effective on textured black exterior trim and barbecue knobs. However, it is important to note that linseed oil may cause light-coloured plastics to yellow over time. Therefore, it is recommended to use this treatment on darker plastics to avoid discolouration.
Other methods to restore faded plastic include using a heat gun on its lowest setting, spraying vinegar on vinyl plastic, or using a diluted mix of bleach, mild detergent, and water on soft outdoor plastics. For deep fading or yellowing, soaking the plastic in hydrogen peroxide under sunlight can reverse discolouration.
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Paint plastic with spray paint designed for plastic
Painting plastic can be a great way to revive its colour, especially if it has been painted before. The first step is to clean the plastic surface thoroughly. Use an all-purpose or sanitizing cleaner, especially if mould or mildew is present. Allow the surface to dry completely. Next, remove any hardware that will be painted separately or left as is. If the plastic is old, use sandpaper to gently smooth the surface, then rinse with water and wipe with a tack cloth. Make sure the surface is free of debris.
Now you're ready to paint. If the plastic has been painted before, you will need to prime it first. Set the plastic down on top of a drop cloth and spray the entire item with a spray primer designed for plastic. Wait 1-2 hours for the primer to dry. Then, grab a spray paint made for plastic. Hold the nozzle 8–12 inches (20–30 cm) away from the surface and move the can back and forth while holding the nozzle down to apply a layer of paint. Wait 1-2 hours for the paint to dry.
It is recommended to apply several light coats of paint, rather than one heavy coat. This will help to prevent flaking and ensure even coverage. You can add multiple layers of paint after letting each layer dry if you want to deepen or darken the colour. If you're adding a pattern or colour-blocking to the item, use painter's tape to mask off your design.
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Apply a UV-resistant sealant to protect plastic from sun damage
To protect plastic items from sun damage, it is essential to apply a UV-resistant sealant. This will create a protective barrier that blocks ultraviolet rays and helps maintain the colour and texture of the plastic. Here are the steps to follow:
Surface Preparation:
Firstly, ensure that the plastic surface is clean and dry before applying any sealant. Use mild soap or pH-balanced cleaners to wash the plastic. Avoid harsh chemicals like bleach unless diluted, as they can damage certain plastics. Dry the surface thoroughly to prevent water spots or mineral buildup. Regular cleaning will also help to prevent micro-scratches, which can accelerate UV damage.
Choosing the Right Sealant:
Look for a UV-resistant sealant that offers long-lasting protection against UV rays. Choose products labelled "UV protection" or "ceramic-based" for the best results. Some recommended products include Graphene VRT or 303 Aerospace Protectant. Additionally, consider the application method that works best for you, such as a brush, roller, or spray gun.
Application Technique:
Follow the manufacturer's instructions for applying the sealant. Apply the sealant evenly and consider using multiple thin coats rather than a single thick coat for better coverage and durability. Ensure that you apply the sealant to all areas that will be exposed to sunlight.
Drying and Curing:
Allow the UV-resistant sealant to dry and cure according to the manufacturer's instructions. Do not expose the plastic to sunlight until the sealant has cured completely.
Reapplication:
Depending on the exposure and product instructions, you may need to reapply the UV-resistant sealant every few months. Regular reapplication will ensure that your plastic surfaces remain protected from sun damage.
By following these steps and choosing the right UV-resistant sealant, you can effectively protect your plastic items from sun damage and maintain their appearance and integrity.
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