How to Restore Flexibility to Brittle Plastics in Older Cars
September 13th, 2024 2:17 PM Mr. Q Categories: Automotive
If you own an older car, especially one that’s been exposed to harsh climates for many years, you may have noticed that the plastic components of the interior and exterior have become brittle over time. This is a common issue with vehicles that have faced long exposure to UV rays, heat, and changing humidity levels. My 20-year-old car spent its first 10 years in the sunny, humid climate of Florida, followed by the last 14 years in Ohio, where winters are cold and dry. Now, many of the plastic parts break when moved or touched.
So, what can you do to restore flexibility to these brittle plastics and prevent further damage? Let’s explore some practical solutions.
Why Does Plastic Become Brittle Over Time?
Car plastics—whether on the dashboard, door panels, or exterior trim—are often made from materials like ABS or PVC. Over time, these plastics lose their flexibility due to:
- UV damage from constant sunlight, which breaks down the plasticizers that keep plastics supple.
- Heat and humidity fluctuations that cause the material to expand and contract, leading to stress cracks and brittleness.
- Age as plastic naturally loses its elasticity over the years.
Solutions for Restoring Flexibility to Plastic
1. Use Plastic Restorers and Conditioners
One of the easiest ways to rejuvenate the flexibility of plastic parts is by applying plastic-specific conditioners or restorers. Products like 303 Aerospace Protectant or Mother’s Back-to-Black are specially formulated to restore the lost oils in the plastic, helping to soften the material and protect it from further UV damage. Apply the product with a microfiber cloth and gently work it into the surface.
2. Heat Application
In some cases, using a heat gun or hair dryer can help soften the plastic, restoring some of its flexibility. Heat works by temporarily relaxing the polymer chains in the material, making it more pliable. However, you’ll need to be very careful not to overheat or melt the plastic. Test on an inconspicuous area first, and keep the heat source moving to avoid damaging the part.
3. Plastic Softeners
Another option is using plastic softeners that penetrate deep into the material. Products like Vinyl Plastic Rejuvenator can help restore flexibility by infusing oils back into the plastic. Apply it to the affected areas, following the instructions carefully to avoid over-softening the material, which could lead to damage.
4. Apply a UV Protectant
Once you’ve restored the plastic, applying a UV protectant is key to maintaining flexibility and preventing future brittleness. A product like 303 Aerospace Protectant not only adds shine but also creates a barrier against harmful UV rays. Regular applications will help slow down further damage from sun exposure.
5. Replace Severely Damaged Parts
For plastic parts that are beyond repair, the only long-term solution might be replacement. You can find aftermarket or OEM replacement parts, or check with salvage yards for less brittle alternatives. While restoration is ideal for slightly damaged parts, replacement might be the best option for those that are cracking or breaking under minimal stress.
6. Preventing Future Damage
Now that you’ve worked to restore your car’s plastic parts, you’ll want to take steps to prevent further damage:
- Park in the shade or use a car cover when possible to protect your car from direct sunlight.
- Use sunshades for your windshield and windows when parking to reduce UV exposure.
- Regularly apply plastic conditioner to maintain the plastic’s flexibility.
Conclusion
Brittle plastics are a common issue in older cars, especially those that have been exposed to varying climates like Florida’s intense sun and Ohio’s cold winters. With some careful restoration efforts using plastic restorers, heat application, and UV protectants, you can restore flexibility to many of your car’s plastic parts and extend their lifespan. If all else fails, replacing the most damaged components may be the best solution to ensure your car looks great and functions well for years to come.