Sofia Martinez
Painting the interior plastic of your car can give it a unique look, but it's important to prepare the surface properly to avoid a messy, peeling finish. First, remove the parts you'll be painting according to your owner's manual. Next, clean the plastic with soap and water, or a solvent-based cleaner, and a rough pad or sponge to remove the shine and create a surface for the paint to grip onto. You can then apply a plastic primer or adhesion promoter, followed by your chosen paint, and finish with a clear coat for extra shine and protection.
How to Prep Car Interior Plastic for Paint
| Characteristics | Values |
|---|---|
| Cleaners | Use soap and water. Avoid dash cleaners with alcohol-based solvents. |
| Protectants | Use a protectant to prevent fading. Look for those containing lanolin and natural moisturizers. |
| Gloves | Wear powderless latex or vinyl gloves when handling the parts. |
| Primer | Use a plastic primer (adhesion promoter) to give the paint something to stick to. SEM and Dupli-Color are recommended brands. |
| Coats | Apply 1-2 thin coats of primer, 3-4 coats of paint, and 1-2 coats of clear coat. |
| Paint | Use paint labelled for use on plastic, fabric, or vinyl. |
| Temperature | Paint at room temperature or above, but not when it is hot or humid. |
| Scuffing | Scuff heavily so the paint has more surface area to grip onto. |
| Cleaning | Soak parts in a bucket of dish soap to remove grease. |
| Owner's manual | Read the owner's manual before removing interior panels for painting. |
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What You'll Learn
- Wear gloves and use a protectant to shield the surface from UV damage
- Remove parts for painting, cover areas you don't want to paint
- Use a plastic primer/adhesion promoter to ensure paint sticks
- Use a base coat, then colour coat, then lacquer for shine and protection
- Take your time, don't paint in hot or humid conditions
Wear gloves and use a protectant to shield the surface from UV damage
When prepping your car's interior plastic for paint, it is important to wear gloves and use a protectant to shield the surface from UV damage. This is a crucial step to ensure the paint job's longevity and to prevent fading.
Wearing Gloves
It is recommended to wear powderless latex or vinyl gloves when handling the car's interior plastic parts during the preparation and painting process. Plastic parts can easily absorb skin oils, which can cause spots or fisheyes on the surface. By wearing gloves, you prevent direct contact between your skin and the plastic, reducing the transfer of oils.
Using a Protectant
After cleaning the plastic surfaces with soap and water or a cleaner, it is essential to apply a protectant. Most dash cleaners contain alcohol-based solvents that can deteriorate the clear coat over time and lead to paint fade. By using a protectant, you create a barrier that shields the surface from UV damage and helps maintain the paint's colour and integrity.
Protectants containing UV inhibitors are ideal for preventing fade. Look for products that contain lanolin and natural moisturizers, as these will nourish and protect the surface. If you cannot find a protectant with these ingredients, a water-based silicone product can also be effective.
Surface Preparation
Before applying the protectant, ensure the surface is thoroughly cleaned and prepared. Use a combination of soap and water or a solvent-based cleaner, such as white spirit, for more stubborn stains. Remember to wear gloves if using a solvent-based cleaner. Scrub the surface with a gray scuff pad, paying extra attention to textured or recessed areas. Rinse with water or wipe away residue with a damp cloth, and allow the surface to dry completely.
By following these steps and wearing gloves during the process, you will help create a clean and protected surface, ready for painting. The protectant will act as a shield, preventing UV damage and ensuring the paint adheres properly to the surface.
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Remove parts for painting, cover areas you don't want to paint
Before you start painting the interior plastic of your car, it is imperative to remove the parts you plan on painting. Not only is it safer to paint them this way, but they will also look better in the end. Start by consulting your owner's manual to understand how to remove the parts properly. Some components will pop right out with minimal effort. For instance, plastic interior trim panels are often held in place by small tabs, so a bit of squeezing, pulling, and wiggling will usually work them free.
Once you have removed the parts, you will need to clean them thoroughly. A good rule of thumb is to soak the parts in a bucket of dish soap and warm water. This will help get rid of years of finger grease, fast-food grease, and other dirt. If there are stubborn stains, you may need to use a cleaner. In that case, be sure to protect the surface with a protectant afterward. Most protectants contain UV inhibitors to prevent fading.
When you are ready to paint, cover any areas of the parts that you do not want to paint. Use painter's tape and plastic shopping bags to mask those areas. Apply the tape to create sharp edge lines between painted and non-painted areas. For larger areas, cut the plastic bags to fit and tape them down.
If you choose to paint interior components without removing them, be extremely thorough in masking over surfaces that you don't want to be painted. This includes the gauges, stereo, windshield, mirror, and so on.
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Use a plastic primer/adhesion promoter to ensure paint sticks
To ensure the paint sticks to the plastic surface, you will need to use a plastic primer, also known as an adhesion promoter. This will give the paint something to stick to, and prevent flaking and chipping. You can use a product like SEM or Dupli-Color, which are both good primers for plastics. These products are typically labelled "Adhesion Promoter".
Hold the can about 8-10 inches away from the surface and apply two wet, even coats of primer. If you get a run in the primer, wait until it is dry, sand it out, and then re-prime. It is important to get primer/promoter on the edges and underside of the part as well. This will help minimize paint flaking off the edges. You may need to apply 3-4 coats of plastic primer, but you can speed up the drying process by using a hairdryer. Remember, a light coat is better than a heavy coat.
If you are unsure of the type of plastic, you can test it by placing a drop of acetone on the back of the plastic and rubbing it with your finger. If the plastic smears and melts, use a product like Sand Free. If acetone has no effect, use a Plastic Adhesion Promoter or XXX Adhesion Promoter. To promote adhesion on plastics such as ABS, PVC, or similar plastics, apply a medium wet coat of Sand Free. While it is still wet, apply a light coat of Color Coat. For plastics such as TPO, EPDM, PP, or other similar thermoplastics, use a Plastic Adhesion Promoter or XXX Adhesion Promoter.
After priming, you will need to apply a base coat of paint. Depending on the colour, it may take 3 to 8 coats to cover. Make sure to leave enough time between coats. Once the colour has completely covered the part, you can apply a lacquer coat for added shine and protection.
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Use a base coat, then colour coat, then lacquer for shine and protection
Painting the interior plastic of your car can be a fun and inexpensive way to refresh your car's interior. It is important to prepare the materials properly and ensure you have the right primer and paint for your specific needs.
First, you will need to remove the parts you will be painting according to your owner's manual. Next, apply 1 to 2 thin coats of primer in short bursts. You can use filler primer to repair scratches or adhesion promoter primer to help the paint stick. SEM and Dupli-Color both make good primers for plastics.
Once the primer is dry, you can apply your base coat. This can be normal car paint in whichever colour you wish to paint. Apply 3 to 4 coats of paint, using paint that is labelled for use on plastic. If you are using a spray can, hold the can about 8-10 inches away and sweep even coats.
After the base coat has dried, you can apply your colour coat. If you are using a darker colour than the base coat, you may need fewer coats. Conversely, if you are using a lighter colour, you may need more coats. Again, allow each layer to dry for around 15 minutes before adding another.
Finally, apply the lacquer. This will protect the base coat and add a shine. Apply 4 to 5 coats of lacquer, gradually building up the thickness. If you are using gloss lacquer, you will get a shinier appearance. Leave the part for a few hours before trying to polish and refit it.
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Take your time, don't paint in hot or humid conditions
Taking your time when prepping and painting car interior plastic is essential to achieving a high-quality, long-lasting finish. Avoid rushing through the process, as this can compromise the overall results.
One crucial factor to consider when painting car interior plastic is the environmental conditions. It is highly recommended to avoid painting in hot or humid weather. High temperatures can cause the paint to dry too quickly, leading to an uneven finish and potential paint defects. On the other hand, humidity can affect the curing process, resulting in a tacky or sticky surface that takes longer to dry.
The ideal conditions for painting car interior plastic are a moderate temperature, typically between 65°F and 85°F (18°C and 29°C), and low humidity. If possible, use a climate-controlled environment, such as a garage or workshop, where you can maintain consistent temperature and humidity levels. This will help ensure that the paint dries and cures properly, resulting in a smooth and durable finish.
Additionally, when painting car interior plastic, it's important to work in a well-ventilated area to ensure your safety and comfort. Wear appropriate personal protective equipment, including a respirator, eye protection, and gloves, to safeguard against any paint fumes or spills. By taking your time and creating the right environment, you'll achieve a professional-looking finish that will transform your car's interior.
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Frequently asked questions
First, remove the parts you will be painting according to the owner's manual. Then, use a combination of painter's tape and plastic bags to mask the areas you don't want to paint. Next, apply 1-2 thin coats of primer in short bursts, using filler primer to repair scratches or adhesion promoter primer to help the paint stick.
SEM and Dupli-Color both make good primers for plastics. They are typically labelled "Adhesion Promoter". Hold the can about 8-10 inches away and give the parts two wet, even coats.
To promote adhesion on plastics, such as ABS, PVC, and other similar plastics, apply a medium wet coat of Sand Free. While still wet, apply a light coat of Color Coat.
Clean the area with SEM Soap and a grey scuff pad. Scrub thoroughly, paying close attention to textured or recessed areas. Rinse with water or wipe away residue with a damp cloth and let dry.
Apply 1-2 coats of clear coat on plastic or vinyl parts for an extra shine and protection. Clear coat will add a little extra shine and protection to your paint job.
