Maya Ellison
Plastic trim on cars has been a common feature since the 1930s, and while it's durable, it can still fade, chip, crack, and break. Luckily, there are several ways to treat and restore plastic trim. This can be done using various products and methods, from simple glue to more complex welding techniques. In this discussion, we will explore different approaches to repairing and restoring plastic trim on vehicles, ensuring they look as good as new.
How to Treat Plastic Trim on a Car
| Characteristics | Values |
|---|---|
| Purpose | To repair or restore plastic trim on a car |
| Plastic Types | ABS, JB Weld, cyanoacrylate (CA or super glue), epoxy |
| Tools | Sandpaper, razor blade, drill, modelling clay, hot stapler plastic repair kit, plastic repair tool, plastic restorer, cleaner, IPA 70-90% (Isopropyl Alcohol), Solution Finish Black Plastic Restorer, Solution Finish Over The Top Plastic Sealer |
| Steps | Clean the trim, sand or drill the damaged area, apply glue or epoxy, sand again after it dries, apply adhesion promotor and primer, use plastic restorer to restore colour |
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What You'll Learn
Repairing cracked plastic trim
To repair cracked plastic trim on a car, you will need to first identify the type of plastic you are working with. Most modern car parts will have the plastic type identified on the back for recycling purposes. Once you know the type of plastic, you can purchase the appropriate supplies for repair.
The first step is to remove any paint from the cracked area and expose the bare plastic. Use 180-grit sandpaper to carefully sand the area and remove the paint. Depending on the extent of the damage, you may need to provide additional support to the cracked area to prevent further damage.
Next, you will need to fill and reinforce the damaged area. Use an automotive-grade flexible epoxy that is compatible with the type of plastic you are repairing. Clean the area with rubbing alcohol and allow it to evaporate before applying the epoxy. Mix the epoxy according to the manufacturer's instructions and apply it using a body filler applicator. Apply additional layers of epoxy as needed, allowing it to harden between applications.
Once the epoxy has cured, use 180-grit sandpaper to block sand the area and shape the repair. Follow the contour of the trim with a flexible rubber pad and 220-grit sandpaper. Clean the area again with rubbing alcohol and apply an adhesion promoter. Then, apply a high-fill primer to fill in any surface imperfections.
After the primer has dried, wet sand the area using 400-grit wet/dry sandpaper. This will help to create a smooth finish on the repaired surface. You may need to repaint the repaired area to match the rest of the trim. Keep in mind that, depending on the severity of the damage and the age of the plastic, your repairs may only be temporary.
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Using adhesives
When it comes to treating plastic trim on a car using adhesives, there are several options available. One popular choice is to use a strong adhesive tape, such as the 3M Super-Strength Molding Tape, which is a double-sided adhesive tape designed for automotive use. This tape provides a permanent and weatherproof hold, making it ideal for attaching side moldings, trim, and emblems to your vehicle. It is easy to use, requiring only cutting, applying, and pressing, and it can be used on various surfaces such as plastic, metal, and carbon fiber.
Another option is to use a liquid adhesive, such as super glue. Super Glue for Cars and Vehicles Liquid Extra Strong is a high-performance adhesive that bonds quickly and easily, working on various materials like mirrors, seats, and plastic parts. It is designed to be heat and weather resistant, making it suitable for tough conditions. When using super glue, it is important to work quickly as it dries fast.
Other liquid adhesives mentioned include Permatex 5-minute plastic weld, Goop, and Yellow Snot (3M Weatherstrip Adhesive). Goop is a non-hardening adhesive that has been known to hold car trim in place for years. Yellow Snot dries to become a hard but flexible substance, although its performance in cold weather is questionable.
When applying adhesives, it is important to clean both surfaces with a solvent and let them dry properly before application. Additionally, consider using painter's tape to protect surrounding areas and to help hold the trim in place while the adhesive cures.
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Protecting against UV rays
The sun's UV rays can be very damaging to your car's plastic trim. Over time, the sun's UV rays can cause plastic trim to fade, crack, and become brittle. Therefore, it is important to take steps to protect your car's plastic trim from UV damage.
One way to protect your car's plastic trim from UV damage is to use a premium protectant or dressing. A premium protectant will create a clear, protective layer that shields against UV rays and prevents fading and degradation. It is recommended to treat the plastic trim while it is still undamaged and unfaded. By regularly applying a protectant, you can extend the life of your trim and keep it looking new.
There are several premium protectants on the market that offer UV protection for car trim. One popular option is Turtle Wax Ice with UV protectant. This product is a clear spray-on wax that can be used on plastic trim to protect against UV damage. Another option is CarPro PERL, a water-based protective dressing that offers UV protection for plastics, rubber, and leather. CarPro Cquartz and DLUX are also ceramic coating options that offer strong UV protection and can protect automotive surfaces for up to a year.
In addition to using a premium protectant, there are a few other ways to protect your car's plastic trim from UV damage. One is to park your car in a garage or shaded area when possible. This will help shield your car from direct sunlight and reduce the amount of UV exposure. Another way to protect your trim is to regularly clean and maintain it. Keeping your trim clean will ensure that protectants adhere better and last longer.
By taking steps to protect your car's plastic trim from UV damage, you can maintain the appearance of your vehicle and extend the life of your trim.
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Cleaning and restoring trim
To restore black plastic trim, you can use a plastic restorer to bring it back to its original factory finish. Firstly, clean the trim with a product like Mothers All-Purpose Cleaner and scrub the entire panel with a pad. You can also use isopropyl alcohol (IPA) to remove any cleaners, oils, or silicones from the plastic. This will ensure the trim is clean and free of any contaminants before applying a restorer.
Once the trim is clean, you can apply a plastic restorer like Solution Finish Black Plastic Restorer. Spread a thin coat of the restorer over the trim using an applicator pad or a microfiber sponge. Allow the solution to penetrate for 3-4 minutes, then use a clean microfiber towel to buff off any excess. For best results, do not wash the treated area for 4 to 6 hours after application.
If the plastic trim is cracked, you can repair it using an automotive-grade flexible epoxy or super glue. Clean the area with rubbing alcohol and then apply the epoxy or glue to fill and reinforce the damaged area. Allow the adhesive to cure, then sand the area with sandpaper to smooth out the shape. You can also use a hot stapler or plastic welding kit for more complex repairs.
To protect the trim from future damage, you can apply a sealant like Solution Finish Over The Top Plastic Sealer. This product helps protect plastic trim from harmful UV rays, fading, and deterioration. It can be used as a standalone treatment or as a topper on plastics that have been restored with a restorer.
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Sanding and drilling
When it comes to sanding and drilling plastic car trim, there are a few important considerations to keep in mind. The goal of sanding is to create a rough surface that will allow paint to adhere properly. It is recommended to use sandpaper with a grit that is rough enough to create a textured surface, but not so rough that the scuff marks are visible through the paint. A grit in the range of 1500 to 180 should be suitable for this purpose. Be sure to sand carefully, providing support to the cracked area to prevent further damage. Once the desired texture is achieved, clean the surface with rubbing alcohol to remove any sanding dust and oils.
After sanding, an adhesion promoter should be applied to the plastic trim. This will further enhance the adhesion of the paint to the surface. Follow the instructions for the adhesion promoter, and then apply a high-fill primer to smooth out any remaining imperfections. Once the primer is dry, wet sand the area using 400-grit wet/dry sandpaper to prepare for painting.
For drilling into plastic car trim, there are a few different techniques and tools that can be used. One method is to use a standard twist bit, which is a type of drill bit commonly used for drilling into wood or metal. It is important to start with a small pilot hole and gradually increase the size of the drill bit to avoid cracking the plastic. Another technique is to use a step drill, which carves through the plastic in a series of small steps, reducing the risk of grabbing or cracking the plastic. Additionally, a hobby knife can be used to carefully cut through the plastic without the need for drilling. When drilling into plastic trim, it is important to follow any manufacturer instructions and take precautions to avoid damaging the trim.
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Frequently asked questions
You can use an automotive-grade flexible epoxy or adhesive to fill and reinforce the damaged area. First, clean the area with isopropyl alcohol or rubbing alcohol and let it evaporate. Then, apply the epoxy with a body filler applicator, adding more if necessary. Once the epoxy has cured, sand the area with 180-grit sandpaper, clean it again, and apply an adhesion promoter followed by a high-fill primer. Finally, wet sand the area using 400-grit wet/dry sandpaper.
You can use a plastic restorer or trim dressing to restore and improve the appearance of your car's plastic trim. Solution Finish Black Plastic Restorer and Solution Finish Over The Top Plastic Sealer are highly recommended products that provide long-lasting protection against UV rays and can be used on new or restored plastic trim.
You can use a plastic sealer or protectant like Solution Finish Over The Top Plastic Sealer to protect your car's plastic trim from harmful UV rays and prevent fading and deterioration. These products can be applied as a standalone treatment or as a topper over a plastic restorer.
You can use a variety of adhesives to repair plastic trim on your car, including super glue (cyanoacrylate), JB Weld, or epoxy. Super glue comes in oily types that may not stick as well, so JB Weld is recommended for its strong adhesion to most surfaces. For ABS parts, ABS cement or melted ABS in acetone can be used for bonding and flexibility.
In addition to adhesives, you can use hot stapler plastic repair kits to mechanically retain the repaired plastic trim. Popular tools include the EZRED rechargeable hot stapler and the Dent Fix DF-400BR Hot Stapler. For welding plastic, the Polyvance 5700HT Mini Weld Model 7 Airless Plastic Welder is a good option.
