Omar Khalid
Repairing plastic radio cabinets can be a complex task, as it involves addressing various issues such as cracks, chips, discolouration, and missing chunks of plastic. The process begins with disassembling the radio and cleaning the plastic cabinet with warm water and dishwashing liquid to remove dust, grime, and dirt. For more stubborn dirt, a toothbrush or a vinegar and water solution can be used. Hairline cracks can be repaired with products such as Plastruct Plastic Weld, while larger breaks may require the use of epoxy, superglue, or hot glue. When filling in missing sections, tape can be used to create a mould, which is then filled with epoxy or Bondo. To match the colour of the original plastic, Polly Plastics pellets can be mixed to create the desired shade. After repairs are complete, the cabinet can be polished with wax or a specialist product like Bake-o-Bryte. It's important to note that repairing vintage radios may impact their value, and some collectors prefer sets that are left untouched.
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What You'll Learn
Cleaning plastic radio cabinets
To clean a plastic radio cabinet, it is important to first remove the back and electronics from the radio, so that you can clean the case without the risk of electrocution. You can then immerse the case in warm water and use washing-up liquid, a soft brush, and a sponge to clean the plastic. It is important to be gentle and avoid using strong products that might hurt the finish of the plastic.
For detailed cleaning, Q-tip cotton swabs and a vinegar/water solution can be used to reach the nooks and crannies of the radio exterior. Small natural bristle paintbrushes can also be useful for this purpose. If there are any knobs or extra features, they should be washed separately, and an old toothbrush can be used to clean the grillwork of the speakers.
After cleaning, the cabinet should be rinsed in clean water and left to dry naturally. A specialist Bakelite polish, such as Bake-o-Bryte, or a good quality wax polish, such as Colron Finishing Wax, can then be applied to the cabinet. If the surface is dull and cloudy, a gentle application of a slightly abrasive polish like Brasso can improve its appearance.
For hairline cracks in the plastic, it is important to clean and dry the inside of the crack to remove any dirt and grime. Plastruct Plastic Weld can then be used to repair the crack, bonding with ABS, Butyrate, Styrene, and Acrylic, among other materials. Clean the plastic around the break and apply the solvent, securing the parts with rubber bands and letting the repair cure for at least 24 hours.
If there are larger breaks or missing chunks of plastic, it is possible to create a replacement chunk by using products such as Polly Plastics pellets, which can be melted in warm water and moulded to fit the missing piece. Matching the colour and sheen of the original plastic can be challenging, and it may be necessary to experiment with different solvents and adhesives to find the correct combination.
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Repairing cracks in plastic radio cabinets
When repairing cracks in plastic radio cabinets, the first step is to identify the type of plastic used. This is important because different plastics require different repair techniques and solvents. Poly(methyl methacrylate) (PMMA), also known as acrylic or Plexiglas, is a common type of plastic used in vintage radios.
Once you have identified the plastic type, you can begin cleaning the crack. Use a toothbrush and a cleaning solution to remove any dirt or grime from the crack. You may need to carefully pry open the crack with a toothpick or shirt pin to ensure that it is thoroughly cleaned. It is important to ensure that the crack is completely dry before proceeding with the repair.
There are several methods for repairing cracks in plastic radio cabinets. One option is to use a product such as Plastruct Plastic Weld, which can be found on Amazon, eBay, or at local hobby shops. This product is designed to repair hairline cracks in plastic and can be applied with a pin oiler for precision. However, it is important to note that Plastruct Plastic Weld should not be used for large cracks, as it may not provide enough strength and rigidity.
For larger cracks, you may need to use a stronger adhesive, such as Plast-T-Pair or a hot glue gun. Mix the Plast-T-Pair to the consistency of bread dough and apply it over and along the cracks, smoothing it out to ensure the electronics still fit inside the case. Secure the parts with rubber bands and let the repair cure for at least 24 hours.
If you have the missing piece of plastic, you can glue it back together using crack repair products such as superglue or epoxy resin. Epoxy resin, such as Araldite, is particularly useful for filling in small gaps. However, if you are missing a chunk of plastic, you may need to create a replacement using products like Polly Plastics pellets, which can be melted in warm water and moulded to fit the missing section.
When using epoxy or filler, you may need to paint over the repaired area to disguise the crack and match the colour of the original plastic. This can be challenging, especially if the cabinet has complex surface finish details or is made of multiple colours. With care and practice, you may be able to mix coloured powder paint with the filler to achieve a close match.
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Matching the colour of the original plastic
If you are repairing a chunk of missing plastic, you will need to create a replacement piece. Polly Plastics pellets are available to purchase and can be mixed with the right combination of coloured pellets to potentially match the set's case. You can also try to closely match the colour of the Bakelite by filing down the back of a knob from the same set or from a back section that is not noticeable. Use the resulting powder mixed with either a clear epoxy resin or superglue.
If your radio cabinet is yellowing or fading due to UV exposure, you may be able to restore the original colour by sanding and polishing the surface. This should be left to a professional restorer.
If you are unable to match the colour of the original plastic, you may need to repaint the entire cabinet. Common car paint colours that match radio cabinets include Ford Vermillion (Commercial) for Philco orange, Vauxhall Brazil Brown for Bakelite and wooden pillars on 30's sets, and Lada's off-white for Murphy louvered fronts.
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Using glue to repair plastic radio cabinets
When repairing plastic radio cabinets, it is important to first identify the type of plastic material you are working with, as different plastics require different repair techniques and solvents. Clean the plastic surface around the break, removing any dirt or grime that could become permanently embedded in the plastic.
If you are repairing a clean break, you can use superglue to glue the pieces back together. Apply a few drops of superglue to a piece of scrap card, and use a pin or wire to apply the glue to the crack. Let the glue work its way into the crack through capillary action. Once the glue is dry, gently remove any excess with a razor blade or modelling knife.
For more complex repairs, such as filling small gaps or rebuilding larger sections, you will need to use an adhesive that can fill voids, such as an epoxy resin like Araldite. You can also use products like Plast-T-Pair or a hot glue gun, which provide more strength and rigidity than superglue. Mix the adhesive to the consistency of bread dough and apply it to the crack, securing the parts with rubber bands while it cures for at least 24 hours. Smooth out the adhesive, ensuring it doesn't interfere with the internal electronics.
If you are missing a chunk of plastic, you can create a replacement chunk by using products like Polly Plastics pellets, which can be melted in warm water, moulded, and dried to match the hardness of the radio cabinet. You can mix different coloured pellets to match the colour of your radio cabinet.
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Painting plastic radio cabinets
Once the cabinet is clean and dry, it is essential to identify the type of plastic material you are working with. Different plastics may require specific repair techniques and solvents. Knowing the plastic type will help you choose the most suitable products and methods for your project.
Before painting, it is recommended to roughen the surface of the plastic slightly. This can be done with fine steel wool or sandpaper. Wet-sanding with 1000-grit sandpaper will smooth out any imperfections and provide a good surface for the paint to adhere to. After sanding, wash the cabinet again with dishwashing liquid and let it dry completely.
Apply a coat of primer to the cabinet and let it dry overnight. It is important not to sand the primer; instead, ensure the primer coat is smooth. Once the primer is dry, you can begin painting. Use a good-quality spray paint designed for plastic surfaces, applying several thin coats rather than one thick coat. Allow each coat to dry before applying the next.
Depending on the desired finish, you may need to apply a clear coat after the final coat of paint. If a glossy finish is preferred, a clear coat can enhance the shine. However, if a more matte finish is desired, gentle rubbing with fine steel wool can dull the gloss.
Keep in mind that repairing and painting plastic radio cabinets can be a challenging process, and it may be difficult to perfectly match the colour and sheen of the original plastic. Experimentation may be required to achieve the desired results.
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Frequently asked questions
Disassemble the radio and wash the plastic cabinet in warm water with washing-up liquid or a vinegar/water solution. Use a toothbrush to scrub away dirt and grime, and a Q-tip to reach smaller areas.
Clean and dry the crack, removing all dirt and grime. You can use Plastruct Plastic Weld to repair hairline cracks, applying it with a pin oiler for precision. For larger cracks, clean the plastic around the break and apply a product such as Plast-T-Pair or hot glue. Smooth the plastic and let the repair cure for at least 24 hours.
You can use products such as Polly Plastics pellets, which melt in warm water and are malleable for about ten minutes before drying. You can mix colours to match your set. Alternatively, you can use tape to hold the remaining pieces in place and fill the gaps with epoxy, Bondo, or fiberglass resin.
You can use a specialist Bakelite polish such as Bake-o-Bryte or a good quality wax polish such as Colron Finishing Wax. If the surface is dull and cloudy, you can try gently applying a slightly abrasive polish. Cigarette ashes can also be used to remove scratches from clear plastic.
