Omar Khalid
Painting an engine cover can be a great way to improve the look of your car's engine bay. While it may seem like a daunting task, with the right tools and preparation, it is definitely achievable. In this discussion, we will explore the steps and techniques for painting plastic engine covers, including the importance of cleaning, choosing the right paint, and achieving the desired finish. We will also address common concerns, such as the necessity of high-temperature paint, to ensure a successful and long-lasting paint job.
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What You'll Learn
Paint type: Krylon Fusion, Rustoleum 2X, or automotive paint
When it comes to painting plastic engine covers, there are a few types of paint that can be used, each with its own advantages. Krylon Fusion All-In-One® is a premium spray paint product that offers strong adhesion to challenging surfaces like plastics. It eliminates the need for sanding or priming and provides maximum rust protection for outdoor projects. The paint is most effective when applied within a temperature range of 55° F to 75° F and with humidity below 60%. Deviating from this range may impact the finish. Krylon Fusion offers a wide range of colours and finishes for both indoor and outdoor use.
Another option is Rustoleum 2X Ultra Cover spray paint, which provides superior coverage and ease of use. It dries quickly and leaves a smooth, durable finish on almost any surface. Rustoleum 2X is suitable for both indoor and outdoor use and offers a variety of trendy paint colours and sheens.
Automotive paint is another option for painting plastic engine covers. It is important to use an adhesion promoter with automotive paint to ensure proper bonding and durability. Additionally, thorough cleaning and preparation of the surface are crucial steps in achieving a satisfactory finish.
When choosing between Krylon Fusion, Rustoleum 2X, or automotive paint for your plastic engine cover, consider factors such as adhesion, preparation requirements, colour options, and rust protection. Each product has unique features that cater to different needs and preferences. Always follow the manufacturer's instructions and recommendations for the best results.
It is worth noting that some people have used regular Rustoleum metallic paint for their engine covers, which has held up well to the heat. However, it is important to consider the specific temperature conditions of your engine bay to ensure the paint can withstand the heat. Additionally, proper preparation, including cleaning and sanding, is essential for achieving a desirable finish.
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Primer: Use or skip a high-heat primer
When it comes to painting plastic engine covers, there are a few things to consider when it comes to priming. While some people suggest that a high-heat primer is not necessary, others argue that it provides a deeper gloss and peace of mind knowing that the paint job can withstand the heat of the engine. Here are a few things to consider:
The type of paint used is crucial. Some spray paints, like Krylon Fusion, are advertised to adhere to plastic without the need for a primer. However, the heat rating of such paints may not be sufficient for engine covers. High-temperature paint is not required but is preferred by some as it can provide better protection against the high temperatures generated by the engine. It is essential to choose a paint that can withstand temperatures of at least 200-220 degrees Fahrenheit, as plastic starts to melt at those temperatures.
The desired finish is another factor to consider. For a high-gloss finish, applying a high-build primer and sanding the covers smooth before painting is recommended. This process will ensure a "smooth as glass" finish, but it may be more challenging to maintain under the hood. A thorough preparation, including cleaning and sanding, is essential for a lasting paint job. Additionally, an adhesion promoter can be used to improve the paint's adhesion to the plastic surface.
Some people opt for a two-stage automotive paint with a two-part clear coat. This method can provide a durable finish, but the texture of the engine cover may slightly dull the gloss or luster. A clear coat gloss can be applied for added protection and a noticeable difference in appearance.
In summary, while a high-heat primer may not be necessary for painting plastic engine covers, it can offer benefits in terms of heat resistance and gloss. The decision to use a primer depends on the desired finish, the level of heat protection needed, and the amount of preparation work one is willing to undertake.
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Prep: Clean thoroughly, sand, and use adhesion promoter
Painting plastic engine covers can be a straightforward process, but it's important to take the time to prepare the surface properly to ensure a long-lasting and high-quality finish. Here are some detailed instructions on how to clean, sand, and use an adhesion promoter to prep your plastic engine cover for painting:
Cleaning:
Thoroughly cleaning the plastic engine cover is crucial to remove any dirt, grease, or grime that may interfere with the paint adhesion. Start by removing the engine cover from your car. You can use a soft brush or a wash mitt to agitate and clean the cover. It is recommended to use a dedicated engine cleaner or a mixture of warm water and soap. After cleaning, make sure to rinse the cover with a damp cloth to remove any residual cleaner. Finally, dry the cover completely with a clean, dry cloth.
Sanding:
Sanding the plastic engine cover creates a rough surface that will help the paint adhere better. It is recommended to use a variety of sandpaper grits, ranging from 400 to 1200 grit. Start with a lower grit and work your way up to a finer grit for a smoother finish. Be sure to sand the entire surface evenly and thoroughly. After sanding, wipe down the cover with a tack cloth or a damp cloth to remove any sanding dust.
Adhesion Promoter:
An adhesion promoter is a crucial step in preparing plastic surfaces for painting. It helps the paint adhere better to the plastic and can improve the durability of the paint job. You can find plastic adhesion promoters specifically designed for this purpose. Apply the adhesion promoter according to the manufacturer's instructions, typically by spraying or wiping it onto the sanded and cleaned surface. Allow the promoter to dry completely before proceeding with the painting process.
Remember, taking your time with the prep work will ensure a better final result. Make sure your work area is well-ventilated and wear the appropriate safety gear, including gloves and eye protection, during the cleaning, sanding, and adhesion promotion process.
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Paint technique: Spray, multiple coats
Spray painting a plastic engine cover is a great way to add a pop of colour to your car's engine. It is important to note that the paint you use should be of good quality and able to withstand high temperatures.
To achieve the best results when spray painting a plastic engine cover, follow these steps:
Step 1: Preparation
Firstly, ensure that the engine cover is thoroughly cleaned. Use a sandblasting cabinet to strip off any existing paint or smooth the surface. Alternatively, you can sand the cover manually, but this will be more time-consuming. Remember to clean off any sanding dust before painting.
Step 2: Primer Application
Apply a high-quality primer designed for plastic surfaces, such as SEM Flexible Primer/Surfacer or Krylon Fusion. The primer will help the paint adhere better to the plastic surface and provide a more durable finish. Allow the primer to dry completely according to the manufacturer's instructions.
Step 3: Spray Painting
When spray painting, use an adhesion promoter and automotive paint designed for plastic surfaces. You can choose from a variety of colours available in spray paint cans, such as Krylon Fusion or Rustoleum 2X. Hold the can about 6-8 inches away from the surface and spray in steady, even strokes. Apply multiple thin coats rather than one thick coat to avoid dripping and ensure a smooth finish. Allow each coat to dry completely before applying the next.
Step 4: Clear Coat (Optional)
If you want to add extra protection and a glossy finish to your painted engine cover, consider applying a clear coat. A high-gloss finish can be achieved by using a high build primer and sanding the cover smooth before applying the clear coat. Allow the clear coat to dry completely.
Step 5: Final Inspection
Once the paint has dried, inspect the engine cover for any imperfections or areas that may need touch-ups. If necessary, sand down any uneven areas and apply another thin coat of paint.
By following these steps and allowing adequate drying time between coats, you can achieve a professional-looking spray-painted plastic engine cover. Remember to work in a well-ventilated area and wear a respirator to protect yourself from paint fumes.
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Finish: Clear gloss coat
To achieve a clear gloss coat finish when painting plastic engine covers, there are several steps to follow. Firstly, it is essential to clean the surface thoroughly. Use soap, hot water, or a suitable cleaning agent to ensure the surface is free from any dirt, grease, or contaminants. Once cleaned, it is advisable to sand the surface to create a smooth base for the paint to adhere to. Use fine-grit sandpaper and sand evenly and gently to avoid damaging the plastic.
The next step is to choose the right paint. While high-temperature paint is not necessary for plastic engine covers, it is essential to select a paint that can withstand the heat generated by the engine. Krylon Fusion spray paint is a popular choice, as it adheres to plastic without the need for a primer. However, if you want a clear gloss coat, you will need to apply a separate clear coat product over your paint. Rustoleum 2X paint, for example, can be used in combination with their gloss clear coat for a durable finish.
Before painting, consider using an adhesion promoter to improve the paint's bond with the plastic surface. This step is especially important for plastic engine covers, as the surface may be flexible or textured, making paint adhesion more challenging. Apply the promoter according to the manufacturer's instructions, typically by spraying or wiping it onto the surface.
Once the surface is prepared and the adhesion promoter (if used) is dry, it's time to paint. Apply multiple thin coats of your chosen paint, allowing each coat to dry before applying the next. This approach will help create a smooth and even finish. After the final coat of paint is completely dry, you can apply the clear gloss coat.
When applying the clear gloss coat, follow the manufacturer's instructions for the best results. Typically, you will spray or brush on a thin, even coat, taking care not to over-apply to avoid drips or an uneven finish. Allow the clear coat to dry completely, and consider applying a second coat for added protection and gloss. A clear gloss coat will not only enhance the appearance of your painted engine cover but also provide a protective barrier, extending the life of your paint job.
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Frequently asked questions
You can use Krylon Fusion spray paint, which is advertised to adhere to plastic with no primer needed. You can also use Rustoleum 2X paint and their gloss clear coat. For a high-gloss finish, you can apply a high-build primer and sand the covers smooth.
High-temp paint is not necessary, but it is preferred. Plastic starts to melt at about 200-220 degrees Celsius, so ensure that the paint you use is rated to those temperatures.
Make sure the surface is thoroughly cleaned and stripped of any existing paint. You can use an adhesion promoter and a primer to ensure the paint adheres well.
Yes, you can add flakes to the paint. The paint will likely be able to withstand the temperatures in the engine bay.
