Ethan Clarke
Spray painting the plastic trim of your car is a great way to give it a new lease of life and improve its overall appearance. It is a simple and cost-effective way to revitalise the exterior of your car without having to resort to expensive respray services. To achieve the best results, it is important to use the correct tools and follow the right techniques. This includes using the appropriate type of paint and primer, sanding the surface, and applying multiple coats of paint and lacquer. In this discussion, we will delve into the step-by-step process of spray painting plastic car trim, offering tips and recommendations for achieving a professional-looking finish.
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What You'll Learn
Choosing the right paint
Type of Plastic
The first step is to identify the type of plastic you are working with. Different types of plastics may require specific types of paint for optimal adhesion and finish. For example, if you are dealing with hard plastics such as ABS or PVC, you may need to start spraying while the adhesion promoter is still wet. On the other hand, flexible plastics like TPO or PP may require you to wait for the adhesion promoter to dry completely before painting.
Paint Compatibility
It is essential to choose a paint that is specifically designed for use on plastic surfaces. Automotive paint suitable for plastics is ideal as it will adhere better and provide a more durable finish. Avoid using standard paint meant for other surfaces, as it may not bond properly with the plastic trim.
Primer Compatibility
Using a primer is crucial when painting plastic trim. The primer will help the paint adhere better and create a longer-lasting finish. Look for a high-build primer designed specifically for plastic surfaces, as regular primers may not provide the same level of adhesion. Follow the manufacturer's instructions for the best results.
Colour and Finish
Consider the colour and finish you desire for your plastic trim. Some paints may offer a wider range of colour options, while others may be limited. Additionally, think about the finish you want to achieve, such as gloss, matte, or satin. Clear lacquer can be applied over the paint to protect the colour and add a shiny appearance.
Environmental Considerations
When choosing a paint, consider the environmental conditions in which you will be working. Paint designed for outdoor use on plastic car trim may have UV-resistant additives to prevent brittleness. If painting indoors, ensure the area is well-ventilated and avoid extreme temperatures that could affect the paint's performance.
Manufacturer Recommendations
Different paint manufacturers may have specific recommendations or requirements for their products. Be sure to read the instructions provided by the paint manufacturer carefully. They may specify the optimal distance to hold the paint can from the surface, the number of coats required, drying times, and other important application techniques.
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Sanding the surface
Firstly, it is important to have the right tools for the job. Get yourself a few different levels of sandpaper, ranging from 150-grit to 1200-grit. Having a variety of grit levels will help you effectively smoothen the surface and remove any imperfections.
Once you have the sandpaper, start sanding the surface of the plastic trim. Work your way up through the grit levels, starting with a lower grit and gradually increasing it. Take your time with this process and be thorough, as the aim is to create a smooth and even surface. It is important to remove the shiny surface from the plastic as this will help the primer and paint adhere better. Ensure you sand off any bobbles or raised marks on the plastic surface.
After you have finished sanding, clean the plastic part with warm or soapy water. This step is important to remove any dirt, dust, or debris that may have been left behind by the sandpaper. A thorough cleaning will ensure that the surface is ready for the next step, which is priming.
By following these steps and taking your time, you will achieve a well-sanded surface that is ready for the subsequent stages of the spray painting process. Remember, a good foundation is key to a high-quality and long-lasting paint job.
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Applying primer
First, it is crucial to select the appropriate primer for plastic surfaces. A high-build primer will ensure that the paint job lasts longer and adheres well to the plastic. Without a suitable primer, the paint may not bond properly, and you will have to redo the paint job sooner than expected.
Before applying the primer, make sure to wear a mask to protect yourself from inhaling any chemicals. It is also recommended to work in a well-ventilated and spacious area to ensure your safety.
When you are ready to start, hold the primer can about 6 to 7 inches away from the car trim. Maintain the can in an upright position and start spraying before it passes over the trim. This technique ensures an even finish across the entire surface. Apply light and consistent coats, and avoid over-saturating the surface to prevent dripping or running.
It is generally recommended to apply 3 to 4 coats of primer, allowing 15 minutes of drying time between each coat. This waiting period ensures that each layer dries sufficiently before applying the next one. You can lightly sand between coats with a fine-grit sandpaper (1000-grit or higher) to smooth out any minor imperfections and ensure an even finish.
After applying the final coat of primer, allow it to dry completely. This may take longer than 15 minutes, depending on the temperature and humidity. You can gently touch the surface to check if it is dry. If it feels tacky or sticky, it is not yet fully cured. Once the primer is dry to the touch, you can proceed to the next step, which is usually sanding, to ensure the surface is perfectly smooth and ready for painting.
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Spraying technique
Firstly, it is essential to prepare the surface properly. Use sandpaper to sand down the plastic surface, working your way up the grit levels. This process helps achieve a smooth base and removes the shiny finish, allowing the paint to adhere better. Take your time with this step, as rushing may result in an uneven surface. Once you're satisfied with the smoothness, clean the sanded part with warm or soapy water to remove any remaining dirt or debris.
The next step is priming. Choose a suitable primer specifically designed for plastic surfaces, as this will ensure that the paint adheres well and lasts longer. Before applying the primer, put on a mask to protect yourself from inhaling any chemicals. Hold the primer can about 6-7 inches away from the surface and keep it upright while spraying. Apply 3 to 4 coats of primer, allowing 15 minutes of drying time between each coat.
Now, you can move on to the painting itself. Select a paint that is suitable for use on plastics, as regular paint may not adhere properly. Hold the paint can in an upright position and maintain a consistent distance of about 6-7 inches from the surface while spraying. Apply 3 to 4 coats of paint, waiting 15 minutes between each coat for it to dry. If you're making a drastic colour change, you may need to apply additional coats of paint.
Finally, apply a clear lacquer to protect the paint job and add shine. Again, hold the can upright and maintain a consistent distance while spraying. Apply 4 to 5 coats of lacquer, allowing 15 minutes of drying time between each coat. Once you've finished applying the lacquer, let it dry for a few hours before removing any masking tape or reattaching the trim.
Remember to always work in a well-ventilated area and protect your surroundings with masking tape to avoid any unwanted paint splatters.
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Finishing touches
Once you’re satisfied with the finish, it is recommended to leave the paint to dry for a few hours before removing the masking tape or reattaching the plastic trim. The final step is to take a clean microfiber cloth and polish the plastic part. This will bring out the shine and remove any loose debris, leaving you with a perfectly smooth surface.
If you are using lacquer, apply four to five coats, leaving each layer to dry for around 15 minutes before adding another. Once you are happy with the finish, leave it to dry for a few hours before removing the tape. Finally, take a clean microfiber cloth and polish the trim to bring out the shine and remove any loose debris.
It is important to wear a mask at all times to ensure you are not inhaling any chemicals. You should also work in a well-ventilated, spacious area.
You can also use a heat gun to bring the oils in the plastic back to the surface if the trim has been damaged by UV radiation. However, do not use a heat gun on anything that is exposed to UV or outdoors.
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Frequently asked questions
You will need automotive spray paint suitable for use on plastics, a mask, a high-build primer, clear lacquer, sandpaper, and a microfiber cloth.
Use sandpaper to sand down the surface and make it as smooth as possible. Work your way up the grit levels to remove the shiny surface from the plastic. Then, clean the plastic part with warm soapy water to remove any dirt or debris.
Wear a mask and ensure you are in a well-ventilated area. Hold the can 6-7 inches away from the plastic trim and keep it upright when spraying. Apply 3-4 coats, waiting 15 minutes between each coat to allow each layer to dry.
Apply 4-5 coats of clear lacquer, waiting 15 minutes between each coat for it to dry. Once satisfied, let it dry for a few hours before removing the masking tape. Finally, polish the plastic trim with a microfiber cloth to bring out the shine and remove any loose debris.
Use automotive paint that is specifically designed for use on plastics. Examples include Rust-Oleum Trim and Body Paint, and British Standard Aerosols, RAL Colour aerosols, or Caliper aerosol paint.
