Sofia Martinez
Plastic is a versatile material used in a variety of products, from car parts to household items. While it is known for its durability, plastic can become scratched, faded, and dull over time. This deterioration is caused by exposure to sunlight, heat, and air, which contain harmful UV rays that break down the plastic's molecular structure, resulting in discolouration and loss of shine. Fortunately, there are several methods to restore plastic items to their former glory. This includes cleaning, polishing, and scratch removal techniques using household items such as toothpaste, baking soda, and sandpaper. However, when aiming to lessen the sheen of plastic, one must be cautious as some methods, like sanding, can leave unwanted scratches. Alternative approaches, such as using a semi-matte clear coat spray or a light wash of matte black paint, can help reduce gloss without causing noticeable damage to the surface.
| Characteristics | Values |
|---|---|
| Sanding | Very light sanding with super-fine sandpaper |
| Spray | Semi-matte/semi-gloss clear coat |
| Wash | Light wash of matt black |
| Chemicals | Acetone |
| Paint | Testor model paints' de-shinning clear coat |
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What You'll Learn
Use fine-grit sandpaper to buff out scratches
Fine-grit sandpaper can be used to buff out scratches from plastic surfaces. It is an effective method to restore smoothness to the scratched item. Before using sandpaper, it is important to clean the plastic surface thoroughly to prevent any loose debris from causing additional scratches. This can be done by using a mild cleanser, such as soap and water, or a small amount of rubbing alcohol applied with a clean cloth or cotton ball.
When using sandpaper on plastic, it is crucial to start with a fine grit, such as 440, and increase the grit gradually if the scratches are not buffing out. Regular grit sandpaper is too harsh for plastic, so micro-grit sandpaper, which is designed specifically for this purpose, should be used. The sandpaper should be dampened with water to prevent it from creating new scratches and to act as a lubricant.
To buff out scratches, use light pressure and gentle, circular motions. Rinse the plastic after each pass of the sandpaper and continue to increase the grit until the scratch has disappeared. Once the scratch is no longer visible, rinse the plastic one final time and dry it with a microfiber cloth.
It is important to note that sanding may dull the finish of the plastic, so it is recommended to test a small area first. Additionally, always work slowly and carefully to avoid creating more scratches.
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Apply a light wash of matt black paint
Painting plastic with a light wash of matt black paint is a great way to reduce its sheen. This method is especially useful for flat black surfaces, which tend to lose their sheen over time.
To begin, ensure the plastic surface is clean and dry. Use a mild cleanser or soap and water to remove any dirt or debris. Rinse the plastic with clean water and dry it with a soft towel.
Once the surface is prepared, it's time to mix your paint. Combine a small amount of matt black paint with a suitable thinner to create a wash. The thinner can be water or a specialised paint thinner, depending on the paint you are using. Mix the two until you have a thin, even consistency.
Next, apply the paint mixture to the plastic surface. Use a soft brush or sponge to gently spread the wash over the plastic, working in the direction of any texture or grain in the plastic. Avoid overloading the brush or sponge to prevent drips and runs.
After application, allow the paint to dry thoroughly. Depending on the paint and thinner used, this may take several hours. Refer to the manufacturer's instructions for specific drying times.
Finally, inspect the finish. If the sheen has been sufficiently reduced, no further steps are needed. However, if the sheen is still prominent, consider applying a second light coat of paint, ensuring you follow the same process as before.
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Use toothpaste on scratches
Toothpaste is a mild abrasive, meaning it can level out the area surrounding a scratch on a surface. It is effective in removing shallow scratches from materials such as plastic, glass, and stainless steel. While toothpaste may be effective in removing shallow scratches, it won’t work for deeper marks.
To determine whether toothpaste will work on a scratch, run your fingernail across the affected surface. If your fingernail catches, it’s probably too deep to be treated with toothpaste.
Before applying toothpaste, clean the surface of the plastic. Use warm water and a few drops of dish soap, or a small amount of rubbing alcohol applied to a clean cloth or cotton ball. If the plastic is small, use a cotton ball and rubbing alcohol. If some of the dirt is stubborn, try a melamine sponge and water to help remove it.
Apply enough toothpaste to cover the scratch. Using a toothbrush or cloth, rub the toothpaste in using small, circular motions until the surface evens out. Rinse off the toothpaste and check whether the scratch has disappeared. If it’s still there, repeat the process until it’s gone.
Whitening toothpastes are best for the job, as they often contain abrasive ingredients. To be sure, check the ingredient list for "silica".
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Soak in hydrogen peroxide and water
Soaking plastic in hydrogen peroxide is an effective way to remove yellow stains and restore discoloured plastic to its original hue. This method is particularly useful for treating plastic that has yellowed due to the presence of bromine compounds, which are added as a fire retardant but can migrate to the surface, causing white plastic to discolour.
To use this method, you will need a container large enough to fully submerge the plastic item. Fill the container with enough 3% or 6% hydrogen peroxide to cover the plastic item completely. If you are treating multiple items, ensure there is enough hydrogen peroxide to cover all the items. Place the plastic item(s) in the container, being careful not to splash any of the liquid.
Once the plastic is in the container, you will need to expose it to direct sunlight or UV light. Set the container in a sunny spot or use a UV LED light source. The ultraviolet light reacts with the hydrogen peroxide, causing a chemical reaction that removes the yellowing and produces oxygen bubbles.
Allow the plastic to soak for 3 to 4 hours, or longer if the discolouration is severe. For electronics or items with multiple parts, the Retrobrite process recommends soaking for 12 to 24 hours. During the soaking process, agitate and turn the parts regularly to prevent oxygen bubbles from forming and to ensure even exposure to the light and hydrogen peroxide.
After soaking, carefully dispose of the hydrogen peroxide solution and rinse the plastic item(s) with clean water. If the plastic is porous, it is recommended to leave the item(s) soaking in clean water to ensure no residual hydrogen peroxide remains. Finally, dry the plastic item(s) and inspect the results.
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Clean with diluted vinegar
Vinegar is an excellent choice for cleaning plastic surfaces. It can cut through grease and grime, leaving your plastics looking shiny and new without harmful chemical residues. To make a vinegar solution, add equal parts vinegar and water. Mix well. You can also add a bit of salt to the mixture to scrub away the grime without scratching the plastic. Allow the mixture to sit on the stains for a few minutes, then use a vinegar-dampened cloth for a final pass over the plastic. Complete the process by rinsing the plastic with clean water and drying it off with a soft towel.
You can also use a mixture of vinegar, detergent, and baking soda to clean plastic. To make this solution, add 1 2/3 cups of baking soda, 1/2 cup of liquid soap, and 2 tablespoons of white vinegar to 1/2 cup of water. Mix well. This mixture is great for cleaning soap scum and grease. Wipe or spray the mixture onto the plastic and scrub to remove any grime. Finally, rinse the plastic with water and dry it with a clean towel.
Another option is to use a mixture of vinegar and water to remove oxidation from vinyl paneling. Mix 5 cups of vinegar with 1 gallon of water and stir to combine. Spray the mixture onto the paneling in small areas at a time so that the vinegar doesn't dry out. Scrub the area with a soft-bristled brush and repeat until the oxidation is gone.
For regular maintenance of plastic items, a simple mixture of vinegar and water can be used to clean and polish the surface. Mix one cup of vinegar with one cup of water and put it in a spray bottle. Work on small sections at a time, spraying the mixture onto the plastic and using a clean, dry cloth to gently polish the surface. Keeping your plastic items clean and polished will help prevent the dull look that plastic develops over time.
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Frequently asked questions
Lightly sand the plastic with very fine-grit sandpaper, using small circles to disguise the sand marks.
Yes, you can use a spray semi-matte/semi-gloss clear coat, or a light wash of matte black paint.
Toothpaste. The silica in toothpaste works on shallow scratches and can remove the sheen.
Yes, you can try a coarse plastic polishing compound like Novus #3.
Mix baking soda and water to make a paste and apply it to the plastic in a circular motion. Rinse off the paste occasionally to see your progress.
