Omar Khalid
Corvette owners often want to paint their cars to make them stand out. The paintwork is what makes the first impression, whether the car is on the road or under scrutiny in a showroom. Painting a Corvette can be done by a professional or as a DIY project. The latter option is more cost-effective and can be done at home, but it requires time and patience. The process of painting plastic Corvette parts involves stripping the car of its original paint, preparing the surface, and then applying an adhesion promoter, primer, basecoat colour, and clearcoat.
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What You'll Learn
Using an adhesion promotor
Adhesion promoters are available at auto parts stores and online for around $20 per can. They are an important step when painting plastic because plastic is different from fibreglass in that adhesion is more difficult due to its lack of porosity.
To use an adhesion promoter, start by scuffing the part with a Scotch pad (red or grey, depending on the grit) or sandpaper. You can also use a heat gun to heat the part, softening the plastic and allowing the adhesion promoter to get down into the plastic. Once you're done scuffing, spray two light coats of the adhesion promoter.
After applying the adhesion promoter, you can add a primer, or base coat, over it. If the plastic panels you bought have a coating, you don't need a primer. If you do use a primer, you can scuff it with a Scotch pad or sandpaper before applying the base coat.
After the base coat, you can apply a clear coat. For a glossy finish, you can wetsand the primer before applying the base coat.
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Base coat/clear coat method
Painting plastic Corvette parts can be a tedious process, but it is doable. The base coat/clear coat method is the best way to paint plastic Corvette parts. This method will give your car a shiny finish and a professional look.
Firstly, you will need to gather your materials and tools. These include thinners, wax and grease removers, cloths, rubbing compounds, abrasives, resins, fiberglass, filler, buffing supplies, adhesion promoter, primer, base coat colour, and clear coat. You can buy these materials online or at your local auto store.
Next, you will need to prepare the surface of the plastic parts by sanding or scuffing them. This will create a rough surface for the paint to adhere to. Once the surface is prepared, you can apply the adhesion promoter. Spray two light coats of the adhesion promoter onto the parts and allow it to dry.
After the adhesion promoter is dry, get a heat gun and hold it about a foot away from the part. Heat the part for about 10 minutes to soften the plastic slightly. This will allow the adhesion promoter to penetrate the surface better.
Now, you are ready to apply the base coat. Spray the base coat colour onto the parts in light, even coats. Allow each coat to dry before applying the next. Two to three coats of the base colour are usually sufficient.
Once the base colour is dry, it's time to apply the clear coat. The clear coat will give your parts a shiny and protective finish. Spray two to three coats of the clear coat, allowing each coat to dry before applying the next.
Finally, let the clear coat cure completely before reassembling the parts. This process may take a few days, but it will ensure that the paint job is durable and long-lasting.
The base coat/clear coat method is a great way to achieve a professional-looking paint job on your plastic Corvette parts. With patience and the right tools, you can achieve excellent results.
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Removing old paint
One DIY method is to use a paint scraper, as mentioned by a user on CorvetteForum.com. This method can be time-consuming and messy, but it effectively removes paint without damaging the fibreglass body or its gel coat. Another user on the same forum suggests using a paint stripper, but warns that it may bite into the filler and cause surprises.
If you're looking for a more efficient and controlled process, you can take your Corvette's plastic parts to an auto body shop for professional painting. These shops have the necessary equipment, such as paint booths, to handle the job. This option may be more suitable if you're uncomfortable with handling paints and tools yourself.
Additionally, there are specific procedures for painting certain parts of your Corvette, such as the fuel rail covers, fluid tanks, brake calipers, and interior pieces. These procedures often involve using adhesion promoters, primers, and specific types of paint designed for plastic, vinyl, or leather surfaces. It's important to follow the manufacturer's instructions and recommended drying times for the best results.
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Choosing the right paint
Painting plastic corvette parts can be a great way to improve the visual appeal of your car, creating a seamless integration with the car's exterior or interior. Before choosing the right paint, it is important to identify the type of plastic the car part is made of. The two main categories of plastics used in car manufacturing are Thermoplastic and Thermoset. Thermoplastic softens when heated, while Thermoset hardens and cures, remaining rigid when heated. Other types of plastics used in car parts include Thermoplastic Olefin (TPO), Polyurethane (TPUR), Acrylonitrile Butadiene Styrene (ABS), and Sheet Moldable Compound (SMC).
Once you have identified the type of plastic, you can choose the proper painting approach. If you are painting new unprimed plastic, it is crucial to clean the part thoroughly to remove any contaminants deposited during manufacturing, such as mold release agents. A hot soap and water wash is recommended to effectively dissolve water-soluble contaminants. After cleaning, the part should be scuffed, but it is important to choose the appropriate abrasive for soft plastics to avoid damage. A gray abrasive pad with sanding paste specifically designed for plastic scuffing is a suitable option.
When selecting the paint, consider the functions and properties of its additives, pigment, and other components. Choose a paint that offers protection from environmental factors such as UV radiation and moisture, which can cause colour fading and degradation. Automotive paints with UV stabilizers are an excellent choice for surfaces exposed to sunlight. Additionally, consider the colour and finish options to achieve a visually appealing and cohesive appearance that integrates well with your car's existing colour scheme.
For a high-quality finish, adhesion promoters are essential. They help create a professional-grade paint finish by improving the adhesion of the paint to the plastic surface. After scuffing the surface, apply several coats of an adhesion promoter, followed by a basecoat colour and a clear coat. Allow sufficient drying time between each coat, and follow the manufacturer's instructions for best results. With the right paint and a careful application process, you can achieve a durable and aesthetically pleasing finish on your plastic corvette parts.
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Painting brake calipers
First, jack up one side of the Corvette, place it on jack stands, and remove the wheels. It is recommended to do a thorough cleaning job of the calipers and the surrounding areas. You can use a spray cleaner, but be careful to avoid getting any cleaner on the paint.
Next, you can choose to remove the calipers or leave them on the car. Removing the calipers gives better access for cleaning and painting, but it requires extra caution when reattaching and bleeding the brake lines. If you choose to leave the calipers on, make sure to cover the rotor with a plastic bag if you don't want to remove the assembly.
Before painting, it is important to use an adhesion promoter to ensure the paint adheres well to the plastic surface. You can scuff the caliper surface with a grey scotch pad and then spray two light coats of the adhesion promoter. Use a heat gun to heat the caliper for about 10 minutes after applying the adhesion promoter to help it penetrate the plastic.
For the paint itself, you can use a brush-on or spray paint designed specifically for brake calipers, such as the G2 Caliper Paint Kit. Mix the catalyst into the epoxy paint and apply multiple thin coats to each caliper, allowing 15-20 minutes between coats. Be careful to watch out for drips and runs.
Finally, let the paint cure undisturbed for at least 24 hours. Do not add any new applications or touch the paint during this period. You can then reattach the wheels and admire your freshly painted brake calipers!
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Frequently asked questions
Painting plastic Corvette parts yourself is a viable option. You can use a few simple tools to paint parts of your Corvette, such as the fuel rail covers and fluid tanks, for less than $100. You can also paint the Corvette's brake calipers, intake manifold, front bumper, and interior parts.
The type of paint you use will depend on the part you are painting. For example, if you are painting interior parts, you can use a specialty type of paint such as Herb's Parts interior paint, which can be used on leather, vinyl, ABS, PVC, and other materials. If you are painting fuel rail covers and fluid tanks, you can use vinyl paint.
To get a smooth finish when painting plastic Corvette parts, you can use an adhesion promoter before applying the paint. Sand the surface of the part to create a smooth finish, then add several coats of the adhesion promoter. Once dry, add the colour coats, followed by at least two clear coats.
