Ethan Clarke
Spray painting plastic car parts is a great way to improve the appearance of your vehicle and give it a new lease of life. It's a simple and cost-effective method to revamp the exterior of your car and can be done at home with the right tools and preparation. In this guide, we'll take you through the steps to spray paint plastic car parts, from choosing the right paint to achieving a smooth and even finish. We'll also offer tips and tricks to ensure a long-lasting and professional-looking paint job.
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What You'll Learn
Choosing the right paint
Type of Plastic
The type of plastic you are painting will determine the suitable spray paint to use. Different plastics have varying properties, and using the wrong type of paint may result in inadequate adhesion or durability.
Paint Composition
The paint's composition, including its additives, pigment, and other components, plays a crucial role in its functionality and aesthetics. For instance, automotive machine shops often use paint with UV stabilizers to protect surfaces from UV ray damage. Understanding the specific functions and properties of these components can help you choose the right paint for your project.
Finish and Appearance
The desired finish and appearance of the painted plastic parts should influence your paint selection. You can choose from various finishes, such as gloss or matte, to achieve the desired look. Additionally, consider the colour and whether you want an exact match or a custom colour.
Paint Application Method
The application method can impact your paint selection. For small car parts, spray cans are typically suitable, while airbrushing is preferred for complex parts due to its higher control and precision. Consider the application method you plan to use and choose a paint compatible with that method.
Primer and Lacquer
Using a suitable primer and lacquer is crucial for a long-lasting paint job. Select a high-build primer designed specifically for plastic surfaces to ensure proper adhesion. Additionally, choose a lacquer that will protect the colour and provide the desired finish.
Work Area Considerations
Consider the workspace where you will be spraying the plastic parts. Choose a well-ventilated, warm, and dry area to ensure proper paint adhesion and avoid imperfections caused by dust, particles, or high humidity.
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Sanding the plastic
Sanding is an important step in preparing plastic car parts for spray painting. It helps improve the adhesion between the paint and the plastic surface, resulting in a longer-lasting paint job. To begin the sanding process, it is recommended to clean the plastic surface with a mild-action detergent or a plastic cleaner to remove any dirt, dust, or other contaminants. This step ensures that the paint will adhere better to the surface.
When sanding plastic car parts, it is crucial to select the appropriate grit-sized sandpaper. The grit size, which refers to the number of abrasives per square inch on the sandpaper, determines the coarseness or fineness of the sandpaper. For light sanding or fixing minor scratches, a fine-grit sandpaper is recommended. This helps create a smoother surface and improves adhesion. It is important to avoid using a very coarse sandpaper, as it may leave observable marks on the plastic.
During the sanding process, it is advisable to keep the sandpaper moist by spraying water on it or using fresh sandpaper frequently. This prevents the sandpaper from drying out and reduces the risk of scratching the plastic surface. Additionally, using a sanding paste designed for plastic scuffing can be beneficial. Sanding paste helps lubricate the sanding pad, prolongs its life, and keeps the surface clean during scuffing. It also prevents the plastic from developing a static charge during the process.
After sanding, the plastic part should be rinsed and dried thoroughly. Compressed air can be used to speed up the drying process. The surface should have a uniformly dull sheen, and any remaining shiny spots should be addressed by repeating the sanding process. Once the sanding is complete, it is essential to clean the plastic part with warm water to remove any residual dirt or debris left by the sandpaper. This ensures that the surface is ready for the subsequent steps of primer application and spray painting.
It is important to note that sanding may not be necessary for all plastic car parts. Some sources suggest that scuffing the surface with a Scotch-Brite pad or using a plastic adhesion promoter can be sufficient to prepare the surface for painting. However, for repaired plastic parts or those with imperfections, sanding is often recommended to achieve a smooth and consistent finish.
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Applying primer
First, it is important to select the appropriate primer for the type of plastic being painted. Different types of plastic may require different primers, so checking the compatibility of the primer with the plastic is crucial. Additionally, the scope and size of the project will determine the application method. For small touch-ups, brushing the primer on by hand with smooth, even strokes can be effective. On the other hand, for larger areas or repainting bigger portions of the car, using a spray gun or aerosol can is recommended.
Before applying the primer, it is essential to prepare the surface of the plastic car part. This involves sanding the surface to make it as smooth as possible and removing any shiny finish from the plastic. It is common to work through different grit levels of sandpaper to achieve the desired smoothness. After sanding, the plastic part should be cleaned with warm water or a specific plastic cleaner to remove any dirt, debris, or grease left by the sandpaper. It is crucial to ensure that the surface is thoroughly dry before proceeding with the primer application.
When applying the primer, it is recommended to wear a mask and ensure good ventilation in the work area. The application distance can vary depending on the product, but generally, it is advised to hold the can or spray gun around 6-7 inches (15-20 cm) away from the surface. Maintaining an upright position of the can or spray gun helps ensure an even finish. Apply 2-4 thin coats of primer, allowing 15 minutes between each coat for sufficient drying time.
By following these steps and allowing the primer to dry thoroughly, you can achieve a properly prepared surface for the subsequent paint application, ensuring a high-quality and long-lasting finish.
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Spraying paint
Spray painting plastic car parts is a great way to revamp the exterior of your car. It is a simple process that can be done at home with the right tools and preparation. Firstly, it is important to have access to a clean room and a draft spray booth. The part should be cleaned with a wax and grease remover and blown with clean air. Use a tack rag to remove any last-minute dust that may have fallen on the surface. Next, use an adhesion promoter to ensure better adhesion between the paint and the plastic. This is especially important for flexible plastic parts.
Afterwards, apply a suitable primer. Priming is a crucial step to ensure the paint adheres well to the plastic surface and to prevent the need for reworking. Use a high-build primer and hold the can about 6-7 inches away from the part. Apply 3-4 coats, allowing 15 minutes of drying time between each coat. Once the primer is dry, you can start spraying the paint. Use automotive paint that is suitable for use on plastics and apply 3-4 coats, again waiting 15 minutes between each coat. For drastic colour changes, more coats may be required.
Finally, apply a clear lacquer to protect the colour and ensure a long-lasting paint job. Apply 4-5 coats of lacquer, allowing each coat to dry for around 15 minutes. Once satisfied with the finish, leave it to dry for a few hours before removing any masking tape or reattaching the plastic trim. Take a clean microfiber cloth and polish the plastic part to bring out the shine and remove any loose debris. Your car part will now have a perfectly smooth and shiny surface.
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Applying lacquer
When applying lacquer, always spray vertical panels from the bottom, working your way to the top in a rhythmic fashion, making sure that each application crosses the previous one by approximately two inches. Horizontal panels, such as a hood, should be painted from one side to the other. Never start in the middle as dry edges will form before you have the chance to apply automotive lacquer to all areas of the panel.
The first coat of lacquer should always be applied lightly. A light initial coat will form a grip coat to which the second coat can adhere without sagging or running. Once the grip coat has started to become tacky, you can apply the gloss coat. Due to the adhesion created by the grip coat, you can move a little slower when applying the gloss coat. However, care must be taken not to move too slowly, as this can cause the lacquer to go on too heavy and result in runs.
Three to five coats of lacquer are typically applied, with adequate flash-off times between each coat. The drying time will depend on the type of lacquer used, with air-drying lacquers drying faster than two-pack lacquers. It is important to strike a balance between applying enough lacquer for adequate polishing and protection while not applying too many coats, which can lead to cracking and crazing.
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Frequently asked questions
Automotive paint that is suitable for use on plastics is best as it will adhere to the surface better.
Firstly, remove the plastic part from the car's exterior. Then, use sandpaper to smooth the surface and remove the shine from the plastic. This will help the paint adhere. After sanding, clean the plastic with warm, soapy water to remove any dirt or debris.
Keep the paint can upright when spraying and apply three to four coats, waiting 15 minutes between each coat to allow each layer to dry.
Apply a clear lacquer with four to five coats to protect the colour and ensure a long-lasting paint job. Leave each coat to dry for 15 minutes before applying another. Once dry, use a microfibre cloth to polish the plastic part and bring out the shine.
Before painting, use masking tape to mask off the surrounding areas of the car and prevent overspray. It is also recommended to wear a mask when working with chemical paints.
