Omar Khalid
Plastic is a versatile material used in a wide range of products, from windows to car headlights and consumer goods. However, plastic is susceptible to scratches and discolouration, which can dull its appearance over time. Fortunately, there are several simple and effective methods to polish plastic and restore its lustre and shine. This process can enhance the transparency of clear plastic and make it look new again.
| Characteristics | Values |
|---|---|
| Cleaning products | Soap and water, vinegar, metal cleaner, rubbing alcohol |
| Abrasives | Toothpaste, baking soda, sandpaper |
| Polishing compounds | CRC Moto Plastic Polish, WD-40, Dremel tool, Zvizzer Heavy Cut polish, Xerapol |
| Tools | Buffing wheel, gas torch, Dremel tool, microfibre cloth, propane burner |
| Techniques | Circular motions, wet sanding, vapor polishing, flame polishing |
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What You'll Learn
Clean the plastic surface with soap and water
To clean the plastic surface with soap and water, start by mixing a few drops of dish soap with warm water. Dip a clean cloth or cotton round into the soapy water, gently cleansing the plastic surface. You can also use rubbing alcohol on a clean cloth as an alternative to soap and water.
After cleaning, wipe the plastic surface with a damp cloth, followed by a dry cloth. Allow the plastic to air-dry completely before moving on to the next step. This initial cleaning step is important to ensure that any loose debris is removed, as debris can cause further scratching when buffing or polishing the plastic.
If your plastic item has light scratches, you can try using toothpaste or baking soda. Apply a small amount of toothpaste to the scratch and buff with a cloth in small circles until the scratch disappears. This may take up to 10 minutes. Alternatively, mix equal parts baking soda and water, applying it to the scratch and working it in for several minutes. Rinse the area when the scratch is no longer visible.
For deeper scratches, you may need to use sandpaper. Wet sanding is ideal for deeper scratches as it slowly levels out the surface of the plastic. Start with a piece of 800-grit wet/dry sandpaper, soaking it in water before use. Sand the area gently in a circular motion, ensuring you don't apply too much pressure to avoid creating new scratches. Rinse the sandpaper and the plastic surface between passes, re-wetting the sandpaper as needed.
If traces of scratches remain, clean the area again and switch to a finer grit sandpaper, such as 1,000 grit. Repeat the circular buffing motion, cleaning the area after each pass.
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Buff out scratches with toothpaste or baking soda
To buff out scratches with toothpaste, squeeze out a small amount of toothpaste to cover the scratch. Using a cotton swab, cotton round, or clean, dry cotton cloth, apply the toothpaste to the scratch in a circular motion, using small movements. Rinse the residue with water and examine your work. It may take a few applications and some elbow grease before you get the results you want.
Toothpaste can also be used in conjunction with baking soda for deeper scratches. Combine equal parts water and baking soda to create a thick paste, then apply it to the scratch with a cotton round or cloth, working it into the scratch in a gentle, circular motion. Rinse periodically to check your progress, repeating until the scratch has disappeared.
If you don't have toothpaste, you can also use a paste made from baking soda and water to buff out scratches. Mix a few drops of water into the baking soda to create a paste, then apply it to the scratches in a circular motion.
Toothpaste is a mild abrasive and is suitable for light scratches. Baking soda is also a light abrasive, but when combined with toothpaste, it can help to buff out deeper scratches.
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Use sandpaper for deeper scratches
Sandpaper is a great option for removing deeper scratches from plastic. It might seem counterintuitive to use sandpaper to remove scratches, but it is an effective buffing method to restore the smoothness of your item. Before you start, clean the plastic surface thoroughly to ensure that any loose debris doesn't cause further scratches.
To start, soak a piece of fine-grade sandpaper in water for several minutes until it is saturated. Then, using gentle, circular motions, rub the sandpaper over the scratched area. Be sure to apply gentle pressure and not too much force, as you could introduce new scratches. Rinse the plastic after every pass with the sandpaper and continue to move to a higher number, finer-grit sandpaper until the scratch has disappeared.
If you are working with a deep scratch, you will need to start with coarser-grit sandpaper, such as 320-grit or 800-grit, before moving to a finer-grit sandpaper, such as 1,000 grit, to finish the job. You can also increase the sandpaper grit in increments for stubborn scratches. Harder plastics may require stronger sandpaper.
Once you have removed the scratch, clean the surface again with a damp cloth. You may notice that the plastic has lost its lustre in the area you worked on. To restore the shine, use a commercial plastic or metal polishing compound. Put a small dab of the compound on a clean, dry cloth and polish the dull area in a circular motion. You may need to repeat this process a few times, but eventually, the plastic will gleam as good as new.
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Apply a polishing compound
Before applying a polishing compound, it is important to clean the plastic surface thoroughly so that any loose debris does not scratch the plastic during the buffing process. Use warm water and a few drops of dish soap or a mild cleanser, or a small amount of rubbing alcohol applied to a clean cloth or cotton round. Next, wipe the plastic with a dry cloth and let it air dry.
After cleaning, if your plastic has scratches, you can use toothpaste, baking soda, or sandpaper to buff them out. For light, shallow scratches, a mild abrasive such as toothpaste or baking soda is usually sufficient for successful removal. Apply a small amount of toothpaste to cover the scratch and buff with a cloth or cotton round in small circles until the surface improves. If toothpaste doesn't work, mix a few drops of water into baking soda to create a paste and apply this to the scratches instead.
For deeper scratches, you can use sandpaper. Wet sanding slowly levels out the surface of the plastic with more force than toothpaste or baking soda, making it ideal for deeper scratches. Start with a fine grit sandpaper and, using water to moisten the sandpaper, sand the area in a gentle circular motion, making sure not to apply too much pressure. If traces of the scratch remain, clean the area again and move on to a higher grit sandpaper, repeating the circular buffing motion and cleaning after each pass.
Once the scratches have been removed, you can apply a polishing compound to restore shine and lustre to the plastic. Moisten a cloth slightly and fold it so that you can hold it between your thumb, index finger, and middle finger. Apply a small amount of polishing compound to the cloth and make circular movements over the surface of the sheet, polishing a large area and not just the scratches themselves. Allow the surface to dry and then wipe it clean with a microfiber cloth.
There are a variety of polishing compounds available for different types of plastics, including plexiglass, resin, and acrylic. Liquid, paste, and putty-style products are available. If you are working with polycarbonate, which has a dark edge, start with the second roughest polishing liquid. A 3-part polishing system can be used, starting with the roughest compound and rubbing in a circular motion until the edges of the scratch are mostly gone. Wipe off the polishing compound and repeat with the next roughest compound. Finally, use the smoothest polisher to finish up, leaving a smooth, scratch-free surface.
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Use a flame to polish acrylic plastic
Flame polishing, also known as fire polishing, is a method of polishing a material, usually glass or thermoplastics, by exposing it to a flame or heat source. This technique is frequently used in acrylic plastic fabrication because of its high speed compared to abrasive methods.
When polishing acrylic with a flame, you are aiming to locally melt the surface without burning it. The low viscosity of the melt and the surface tension in the liquid plastic will smooth out the surface. Operator skill is critical with this method, and if done properly, flame polishing produces the clearest finish, especially when polishing acrylic.
To polish acrylic plastic with a flame, start by holding the acrylic edge up using a flame-resistant glove. Turn on your handheld gas torch and run it along the edge of the acrylic quickly, so it heats up and smooths out. For best results, use an oxyhydrogen torch, as the flame chemistry is unlikely to contaminate the plastic.
As an alternative to a handheld gas torch, you could use an oxy-propane or oxy-acetylene torch. You could also try a "Jeweller's" scale torch, which is better suited for smaller pieces.
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