Maya Ellison
Matching plastic paint to trim can be a challenging task, especially when dealing with specific colours and paint types. The process involves several steps, including preparing the surface by sanding and cleaning, selecting the appropriate primer, and finding the right paint colour match. It is important to work in a well-ventilated area due to the presence of flammable paint fumes. In addition, the amount of paint required depends on the surface area being covered. When it comes to colour matching, various techniques can be employed, such as using colour swatches or taking a paint sample to a store for analysis.
| Characteristics | Values |
|---|---|
| Safety Precautions | Work in a well-ventilated area with proper protection, away from hot surfaces and open fire |
| Tools | Torx screwdriver, sandpaper, scissors, eye and nose protection, primer, paint |
| Process | 1. Remove panels 2. Sand down the panel 3. Apply primer 4. Apply paint |
| Paint Matching | Take a sample of the plastic trim to the paint store for matching, or use a spectrophotometer to determine the exact combination of paint pigments needed |
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What You'll Learn
Sanding and priming the plastic trim
Painting plastic trim can be challenging due to the material's chemical composition and smooth surface, which hinder paint adhesion. The fact that plastic expands and contracts more than other surfaces also makes it prone to flaking. However, with proper preparation and the use of suitable products, you can achieve a durable finish.
Before starting, ensure you have the necessary safety equipment, including protection for your eyes and nose, and work in a well-ventilated area to avoid inhaling paint fumes, which can be dangerous.
To begin the process of sanding and priming the plastic trim:
- Sand the Trim: Start with a coarse grit sandpaper, such as 180-grit, to remove any existing texture or shine from the plastic. You can use a D/A sander or sand by hand. This step will create a rough surface to which the primer can adhere.
- Clean the Trim: After sanding, use a wax and grease remover to clean the plastic surface. This step is crucial for ensuring that the primer adheres properly.
- Apply a Plastic Adhesion Promoter (optional): Some sources recommend applying a plastic adhesion promoter to the sanded and cleaned surface. This step may help improve the adhesion of the primer and paint. However, some people skip this step without issues.
- Prime the Trim: Apply a high-build primer designed for plastic surfaces. Use a light coat of straight-to-plastic primer and let it dry completely in a dust-free area. You may need to apply multiple coats of primer, following the manufacturer's instructions.
- Sand the Primer (optional): After the primer has dried, you may need to sand it lightly with fine-grit sandpaper, such as 400-grit or 600-grit. This step helps create an even smoother surface for the paint to adhere to.
- Re-prime if Necessary: Depending on the smoothness and adhesion of the primer, you may need to apply another coat of primer. Ensure each coat of primer is thoroughly dry before proceeding to the next step.
Remember to always work in a well-ventilated area, follow safety precautions, and refer to the manufacturer's instructions for specific recommendations regarding the products you are using.
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Using a spectrophotometer to determine the exact paint pigments
When it comes to matching plastic paint to trim, a spectrophotometer can be a highly effective tool. This device, about the size of a shoebox, is used to determine the exact paint pigments needed to match a specific colour. It does so by measuring colour electronically and analysing the various wavelengths of light reflected off an object.
The process of using a spectrophotometer is straightforward and user-friendly. The device is hooked up to a touchscreen computer monitor that guides the operator through the process. To use the spectrophotometer, a sample of the desired colour is placed in front of the device's port, which shines a light on the object. The device then takes a sophisticated reading of each wavelength of light reflected off the object.
This reading is converted into an electronic signal, which is sent to computer software. This software then formulates the precise amount of pigments required to recreate the desired colour. This information is stored digitally, similar to the data that would be used to create a photograph. By following the specifications provided by the spectrophotometer, paint manufacturers can mix the exact pigments needed to achieve the desired colour match.
Spectrophotometers are widely used in the paint industry, including for wall paint touch-ups and matching custom paint colours. They are also commonly employed in high-end oil paint manufacturing to ensure colour accuracy and consistency. By using spectrophotometric colour measurement, paint manufacturers can guarantee the colour of their products, minimise waste, and improve overall quality.
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Removing the panels from doors
To remove the panels from doors, follow these steps:
First, locate the door latch and remove the screw attached to the panel. Use a pair of pliers to gently pull the door latch away from the panel. Be careful not to yank or twist the latch, as this could damage the connecting clips. Then, use a screwdriver to wedge into the lower edge of the control panel and pry it up. Gently apply pressure to pop it out of place. The control panel is usually held in place by small connecting clips, so be cautious not to snap or jerk the screwdriver when removing it.
Once the control panel is disconnected, you need to disconnect the wires from the backside of the panel. Locate the plugs, grip them firmly, and gently wiggle them as you pull them off. Remove any plugs attached to the control panel, along with the clip wire and window crank. Some cars may have a manual window crank. If so, use a metal pick tool to wedge behind the crank and locate the small clip wire to slide it out.
After removing the plugs and window crank, you can now focus on removing the panel itself. Use a screwdriver to pry off the trim pieces, screw covers, and any remaining screws from the door panel. Grab the door panel at the top and bottom, wiggle it loose, and then gently pull it out with your hands. Be cautious, as there may still be wiring attached at the rear of the panel.
Once the panel is removed, place it in a safe area away from the work area to prevent it from getting dirty or greasy. Remember to handle it with care, especially if it has a cloth covering, as these panels can easily pick up dirt and stains.
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Using a light coat of straight-to-plastic primer
Painting plastic is a challenging task due to its chemical composition and smooth surface, which do not promote good paint adhesion. However, with the right preparation and products, it is possible to achieve an excellent finish. Here is a detailed guide on using a light coat of straight-to-plastic primer to match plastic paint to trim:
Preparation:
Before applying the primer, it is crucial to prepare the plastic surface. Start by removing any panels or parts that you will be painting. Use a screwdriver or wrench to detach them carefully. Ensure you are working in a well-ventilated area to manage paint fumes, and wear protective gear, including eye protection, respiratory protection, and gloves, as paint chemicals can be harmful.
Next, use sandpaper to sand down the plastic surface until it becomes dull and loses its shine. This process helps create a rougher surface to which the primer and paint can better adhere. Work your way up through the grit levels of sandpaper to achieve a smooth finish, and remember to wipe away any sanding residue with a tack cloth or a clean rag.
Applying the Primer:
Once the surface is prepared, you can begin applying the straight-to-plastic primer. Shake the primer can well, as it contains heavy solids, and always wear a mask or respirator to protect yourself from the chemicals in the primer. Hold the primer can about 6-7 inches away from the plastic surface. Apply light, even coats, and ensure you cover all areas. It is recommended to apply two or more thin coats, waiting about 10 minutes between each coat to allow for proper drying.
After applying each coat, inspect the surface for thin areas or imperfections. If necessary, apply additional light coats of primer to ensure an even and consistent coverage. Once you are satisfied with the primer application, allow it to dry completely. This typically takes about 24 hours in a warm, dry area.
Final Steps:
After the primer is dry, you can proceed with light sanding to ensure the surface is smooth and free of any visible imperfections. If necessary, you can sand through the primer to the base material to eliminate any streaks or cracks. Remember to change the sandpaper frequently to avoid the primer sticking to it. Once the sanding is complete, wipe down the surface with a clean rag to remove any remaining dust.
Now, your plastic surface is ready for the final coat of paint. Remember to choose a paint specifically designed for use on plastics to ensure better adhesion and durability. Always follow the specific instructions provided with your chosen paint product for the best results.
By following these detailed steps for using a light coat of straight-to-plastic primer, you can achieve a professional-looking finish and successfully match plastic paint to trim.
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Getting a custom paint mix from a local store
When visiting your local paint store, it's a good idea to bring a sample of the colour you want to match. This can be a small piece of the trim you're trying to match or even just the trim code. With this, the store should be able to create a custom paint mix that closely matches your trim.
Some stores may also offer custom paint mixing for specific paint brands, like SEM. It's worth checking with your local paint stores to see if they offer this service and if they carry the brand you're looking for.
In addition to automotive paint stores, some general hardware or home improvement stores may also offer custom paint mixing services. These stores often have a wide range of paint colours and can help you create a custom mix to match your trim.
When getting a custom paint mix, it's important to keep in mind that the accuracy of the colour match may depend on various factors, including the mixing ratios and the original colour of the trim. It's always a good idea to test the paint on a small area first to ensure that you're happy with the colour match before proceeding with your project.
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Frequently asked questions
Matching plastic paint to trim is a tricky process and a 100% match is not always possible. However, you can get a close match by taking a sample of the plastic trim to an auto paint store. They will be able to scan it or use a spectrophotometer to determine the colour and create a matching paint.
First, you need to remove the trim and sand it down until it has no shine. Then, wipe off any residue. Next, apply a light coat of primer and let it dry in a dust-free area. Finally, apply the paint.
It is recommended to use a paint that is intended for interior plastics. You can also use elastomeric paint, which can be custom-mixed to match your trim.
