Omar Khalid
Painting an engine cover can be a fun DIY project, but it's important to do it right. The first step is to decide on the type of paint. While some people recommend high-temp paint, others argue that it's unnecessary since the engine doesn't get hot enough to require it. However, using a high-heat primer can give you peace of mind and a deeper gloss. Next, you'll need to prepare the surface by stripping off any existing paint and cleaning the cover thoroughly. This step is crucial, as a proper prep job can make or break your paint job. Once the cover is clean, you may want to sand it down for a smoother finish. Finally, it's time to paint! Choose a high-quality paint like Krylon Fusion or automotive paint, and don't forget to wear a respirator for safety. With the right tools and preparation, your engine cover will be looking brand new!
How to paint engine cover plastic
| Characteristics | Values |
|---|---|
| Paint type | High-temp paint is not necessary but preferred. Krylon Fusion spray paint is recommended as it adheres to plastic without the need for primer. |
| Prepping | Thorough prepping is required. Sandblasting is recommended to save time. Ensure the cover is clean and scuffed with a Scotch Brite pad. |
| Paint application | Use an adhesion promoter and automotive paint. |
| Paint finish | To achieve a high gloss finish, apply a high build primer and sand the covers until smooth. |
| Additional considerations | Wear a respirator when using spray paint. |
Explore related products
What You'll Learn
Paint type: Krylon Fusion, Rust-Oleum, or high-temp paint?
Krylon Fusion is a spray paint that bonds with plastic without the need for sanding or priming. It is a premium product that provides maximum rust protection for outdoor projects and comes in a variety of colours and finishes. However, it is reportedly not beneficial for adhesion on ABS or other bondable plastics and may not hold up to handling. It is also difficult to find, with some sellers charging high prices for old stock.
Rust-Oleum is another low-cost spray paint option. It provides a reliable and durable finish when given proper prep and primer and cure time. It is available in small quantities from local body shop suppliers and can be sprayed using refillable aerosol cans. Some users have reported good experiences with Rust-Oleum, with no peeling or fading.
High-temp paint is not necessary for painting engine covers, but it is preferred by some. It is important to note that plastic starts to melt at around 200-220 degrees Celsius, so choose a paint that is rated for these temperatures. Engine paint with a high-heat primer will give you peace of mind that it can withstand the heat.
Painting Plastic Siding: A Step-by-Step Guide
You may want to see also
Explore related products
$15.63
Prepping the engine cover
Step 1: Disassemble the Engine
Begin by disassembling the engine to access the cover. Remove all bolt-on parts, including the power steering pump, water pump, air intake manifold, and pulleys. Take off the timing cover, cylinder heads, and any remaining bolt-on components. It is important to note that you should not paint the cylinder head mounting surfaces, so cover them with newspaper and tape to protect them.
Step 2: Clean the Engine Cover
Use a chemical paint stripper or a media blaster to remove any old paint, powder coating, or corrosion from the engine cover. If using a chemical paint stripper, spray it onto the surface and wait a few minutes for it to take effect before scrubbing with a grill brush and rinsing with water. Repeat this process until all the old paint is removed. If using a media blaster, fill the hopper with soda media (granular baking soda) and attach it to an air compressor. This method safely removes paint and corrosion without damaging internal engine parts.
Step 3: Dry and Prepare the Surface
After the engine cover is free of paint, dry it off thoroughly. Use paint preparation wipes or denatured alcohol to wipe down the surface, ensuring it is spotlessly clean and free of any film or residue. Do not use mineral spirits, paint thinner, or lacquer thinner, as they can leave a film on the plastic surface.
Step 4: Sand the Surface
Lightly sand the engine cover with fine-grit sandpaper (320 to 800-grade) to roughen the surface and improve paint adhesion. Get into all the crevices and cracks to ensure a consistent finish. If the engine cover has rust, use a wire wheel and a rust converter product to treat it before sanding.
Step 5: Prime the Surface
Although some paint products claim that primer is not necessary, it is recommended to apply a light coat of primer to the engine cover. Choose a primer specifically designed for plastic surfaces, such as a plastic primer or an adhesion promoter. This will help the paint adhere better and create a more durable finish.
Step 6: Final Checks
Before proceeding to paint the engine cover, double-check that all surfaces you do not want to paint are covered and protected. Ensure there are no openings to the inside of the engine, and all small bolt holes and studs are taped or covered.
By following these steps, you will properly prep your engine cover, ensuring that the new paint adheres well and that your engine looks great and is protected from the elements.
Painting a Plastic Fire Helmet: A Step-by-Step Guide
You may want to see also
Explore related products
![12 Oz Gloss Black Engine Enamel Spray Paint 248932 [Set of 6]](https://m.media-amazon.com/images/I/71GZcpNLDyL._AC_UL320_.jpg)
Using a primer
There are a few different types of primers that can be used on plastic engine covers. One option is a high-build primer, which will give a smooth, glossy finish. This type of primer will need to be sanded down after application to create a smooth surface for the paint to adhere to. Another option is a flexible primer, which is designed to move with the plastic as it expands and contracts with temperature changes. This type of primer does not usually require sanding, but it is important to read the manufacturer's instructions to be sure.
When applying the primer, it is important to use a thin, even coat. This can be done with a spray primer or a brush. Be sure to follow the manufacturer's instructions for drying time before moving on to the next step, which is usually painting.
It is also important to consider the type of paint that will be used. A high-quality paint designed for use on automotive plastics is recommended. This type of paint will be able to withstand high temperatures and will not crack or peel over time. It is also important to consider the colour of the paint, as some colours may require multiple coats for full coverage.
Finally, once the paint is dry, a clear coat can be applied for added protection and shine. This will help to protect the paint from chips and scratches and will give a glossy finish.
Scuff Removal from Plastic Bumpers: Easy DIY Guide
You may want to see also
Explore related products
Adding a clear coat
When it comes to adding a clear coat to painted plastic engine covers, there are several important considerations and steps to follow. Firstly, it is crucial to understand that not all plastics are the same, and the type of plastic can determine whether and how you apply the clear coat. For instance, extremely flexible plastics that experience a lot of movement or hard plastics like Delrin may require different application methods.
Before applying the clear coat, it is essential to prepare the surface properly. This includes cleaning the surface with a suitable cleaner and a lint-free rag to remove any contaminants such as oils, dirt, or debris that could ruin your clear coat. Additionally, abrading the surface with a scuff pad or sandpaper can help the clear coat adhere better. You can also use a woven pad in conjunction with a paint prep cleaner, wiping away the excess residue after each pass.
If the plastic experiences a lot of flex or abuse, applying an adhesion promoter is highly recommended. This will help prevent the clear coat from flaking or peeling during normal use. Bulldog Adhesion Promoter is a popular choice for plastic and metal surfaces. For extremely flexible plastics, consider adding a small amount of flex agent to the final coats of the clear coat, following the manufacturer's mixing instructions.
When choosing a clear coat product, opt for one that is specifically designed for plastic and is compatible with the type of plastic you are working with. Plastics are known for rejecting coatings, so selecting the right product is crucial. You may also want to consider a UV protective clear coat to prevent discolouration and fading from sunlight exposure.
The Best Paint Adhesion Techniques for Plastic Door Handles
You may want to see also
Explore related products
$50.99
Painting techniques
Preparation:
Firstly, ensure you have the necessary tools and a clean workspace. Remove the engine cover from the vehicle and place it on a flat surface. If there is existing paint on the cover, strip it off. Clean the cover thoroughly, paying extra attention to areas like the oil dipstick. Use a Scotch-Brite pad to scuff the surface and ensure the paint will adhere properly. If you want a high-gloss finish, you may need to sand the cover smooth and apply a high-build primer. It is crucial to ensure the cover is free of any sanding dust before painting.
Paint Selection:
Selecting the right paint is essential. Choose a high-quality paint designed for automotive use, preferably one that adheres well to plastic, such as Krylon Fusion. Consider the temperature range the paint can withstand; plastic starts to melt at around 200-220°C, so choose a paint rated for similar temperatures. If you desire a high-temperature paint, look for one specifically labelled as such. You can also use automotive 2-stage paint with a 2-part clear coat for a durable finish.
Application:
When applying the paint, follow the manufacturer's instructions. Typically, it involves shaking the can, holding it 6-12 inches away from the surface, and spraying in a steady back-and-forth motion. Ensure you are in a well-ventilated area or wearing a respirator to protect yourself from fumes. Apply light, even coats to avoid dripping. Allow sufficient drying time between coats, and consider using a clear coat for added protection and shine.
Final Steps:
Once you've achieved the desired coverage and gloss, allow the paint to cure completely before reattaching the engine cover to your vehicle. Refer to the paint manufacturer's instructions for the recommended curing time. After curing, your painted engine cover should be ready to withstand the engine bay temperatures and look great for years.
Ombré Acrylic Painting on Plastic: Easy DIY Guide
You may want to see also
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 Rust-Oleum, which also works well with plastic.
It is not necessary, but it is preferred. You can get a high-heat primer to get a deep gloss.
Make sure the cover is clean and scuffed with a Scotch Brite pad. You can also sandblast the cover to save time.
A high gloss finish would require you to apply a high-build primer and sand the cover smooth. A clear coat gloss can also be applied for a noticeable difference.
No, the oven used to cure the powder coat can melt the plastic.
