Inboard Boat Engine Colors: What's Your Perfect Shade?

Painting an inboard boat engine is a topic of interest for many boat owners. While some people prefer to paint their engines in bright colours, others opt for more subtle shades like grey or white. There are several factors to consider when choosing a colour for an inboard boat engine. Firstly, the colour should be aesthetically pleasing to the owner. Additionally, the paint should be able to withstand high temperatures and protect the engine from rust and corrosion. It is also important to consider the ease of cleaning and maintenance when selecting a colour. Some boat owners prefer to use engine enamel or Rustoleum enamel paint, which offers better protection against oil and grease.

Engine paint colours

When it comes to painting an inboard boat engine, there are a few factors to consider. Firstly, the paint should be able to withstand high temperatures, as the engine can reach temperatures of up to 300 degrees Fahrenheit. Secondly, the paint should be oil and grease resistant, as the engine will be exposed to grease and oil. Thirdly, the paint colour should make it easy to identify oil leaks, as this will help with maintenance and upkeep.

One popular colour choice for inboard boat engines is light grey. This colour can be found in most hardware stores and is often available in Rustoleum enamel, which is a durable and grease-resistant option. Light grey is also a good choice because it makes oil leaks easy to spot. Another option is to use engine enamel, which is designed to withstand high temperatures and is available in most parts stores. If you want to get creative, you can choose a colour that matches the boat's exterior or interior, such as white, blue, or even the Chicago Bears colours!

When it comes to painting your engine, there are a few techniques you can use. One option is to use a brush to apply the paint. This method allows for more pressure to be applied, resulting in a better bond between the paint and the engine surface. Alternatively, you can use a spray paint, such as an aerosol can, which is easy to apply and can reach tight spaces. If you decide to spray paint, look for a spray can that can spray at any angle, as this will make it easier to paint hard-to-reach areas.

Before painting your engine, it is important to properly prepare the surface. This includes degreasing the engine to remove any oil or grease, as well as removing any rust or scale. Once the surface is clean, you should prime it to protect against rust and corrosion, and to improve the adhesion of the topcoat. When choosing a primer, consider using zinc chromate or cold galvanizing primer for steel surfaces. After priming, you can apply your chosen paint colour, following the manufacturer's instructions for drying time and coats recommended.

Pros and cons of painting an inboard engine

Painting an inboard engine can be a great way to improve the aesthetic appeal of your boat's engine, but there are other benefits and drawbacks to consider before starting this project.

Pros of Painting an Inboard Engine:

• Protection against rust and corrosion: Engine paints are designed to protect the metal surfaces of engines from rust and corrosion. This is especially important for inboard engines that are exposed to saltwater and harsh marine environments.
• Ease of cleaning: A smooth coat of paint can make the engine's surface easier to wipe down and keep clean.
• Leak detection: Choosing a paint colour that contrasts with the colour of oil can make leaks more visible, alerting you to maintenance issues.
• Aesthetic appeal: A fresh coat of paint can improve the overall appearance of your engine, making it look sharp and well-maintained.

Cons of Painting an Inboard Engine:

• Time and effort: Painting an engine is a labour-intensive process that requires thorough preparation, including degreasing, rust removal, and priming.
• Ventilation and safety: The painting process requires good ventilation due to the use of chemicals and paint fumes.
• Matching the colour: Finding the exact OEM colour to match the original engine colour can be challenging.
• Peeling and flaking: If the paint is not applied correctly or if the engine is not properly prepared, the paint may peel or flake off over time, requiring touch-ups or re-painting.
• Heat resistance: Standard paint may not be able to withstand the high temperatures generated by the engine, so it's important to choose engine paint that is heat-resistant.

Overall, painting an inboard engine can provide protection and improve aesthetics, but it requires careful preparation and the right choice of paint to ensure a long-lasting and effective finish.

Paint application methods

Painting your boat engine can protect it from rust and corrosion, make oil leaks more visible, and make the engine easier to clean. Before painting, it is important to prepare the surface by degreasing, removing rust, and priming.

There are several methods for applying paint to an inboard boat engine. The most common methods are brushing and spraying.

If you choose to brush the paint on, be sure to use a brush that is suitable for the type of paint you are using. For example, if you are using an engine enamel, a natural bristle brush is recommended. Synthetic brushes can also be used, but they may not provide as smooth of a finish. When brushing, apply the paint in even strokes, and be sure to cover all areas of the engine that are prone to rust or corrosion.

If you prefer to spray the paint on, there are a few different options available. One option is to use a traditional spray gun, which can be either a gravity-fed or siphon-fed model. Gravity-fed spray guns have a cup attached to the top of the gun that holds the paint, while siphon-fed guns have a cup attached to the bottom of the gun. Another option is to use a high-volume low-pressure (HVLP) spray gun, which uses a lower air pressure and higher volume of paint to reduce overspray and provide a more efficient paint application. When spraying, be sure to hold the gun at the correct distance from the surface of the engine and move it at a steady pace to ensure an even coat of paint.

In addition to traditional spray guns, you can also use aerosol cans, also known as "rattle cans," for spray painting your boat engine. These cans are easy to use and can provide good results, especially if you are painting in a cramped space. When using aerosol cans, be sure to follow the instructions on the can and wear the appropriate safety gear, such as a respirator and eye protection.

Another method for applying paint is by using a roller. This method can be more efficient than brushing, as it covers a larger area in a shorter amount of time. When using a roller, be sure to choose the right type of roller cover for the paint you are using. For example, a foam roller cover is typically used for oil-based paints, while a synthetic roller cover is used for water-based paints. When rolling, apply the paint in even strokes, and be careful not to overload the roller, as this can cause drips and runs.

Regardless of the application method you choose, it is important to follow the instructions on the paint can and allow the paint to dry thoroughly between coats. It is also recommended to apply a clear coat over the paint to provide additional protection and a glossy finish.

Paint primers

Painting your boat's engine can protect the metal surfaces from rust and corrosion, and a primer is an essential step in this process. Priming the surface will also improve the adhesion of the topcoat.

Before priming, it is important to prepare the engine surface by degreasing and removing any rust and scale. Some people suggest using a wire brush to tackle any rusty areas or spots where paint is peeling, and then cleaning the engine with acetone or mineral spirits to remove any remaining oils, dirt, or grease. Others recommend a solvent such as oven cleaner or an alkaline degreaser like 409 or industrial-strength 409, followed by a rinse to remove any alkalinity.

There are a variety of primers available for use on boat engines. Some sources recommend an epoxy primer, such as Tuff Stuff by Sea Hawk Paints, Interlux Interprotect 2000E, or Pettit Protect High Build Epoxy Primer. Zinc chromate primer is also suggested as a good option for steel and iron, though another source recommends cold galvanizing primer for steel. If you are painting over aluminum, one source suggests using a strontium chromate primer.

Once the primer is applied, you can follow up with a topcoat. Many topcoats are offered in OEM colors to match the original color of the engine.

Paint brands and types

Painting an inboard boat engine is important for several reasons. Firstly, it protects the engine from rust and corrosion. Secondly, the paint creates a smooth surface that makes cleaning the engine easier. Lastly, the right colour of paint can help identify oil leaks more easily.

When it comes to paint brands and types, there are several options available. Here are some recommendations and considerations:

• Engine Enamel: Engine enamel is designed to withstand high temperatures and is grease-resistant. It is a good option for inboard boat engines as it can handle the heat generated by the engine.
• Rustoleum Enamel: Rustoleum enamel is mentioned multiple times in the WoodenBoat Forum as a recommended paint for inboard engines. It is available in light grey, white, and almond colours, which are suitable for various engine models. Rustoleum enamel can be brushed or sprayed on and is known for its corrosion resistance.
• Cummins Rattle Cans: If you want to match the factory colour of your Cummins engine, they offer rattle cans that are easy to use for touch-ups and painting.
• POR15 Engine Painting Kit: POR15 offers a comprehensive engine painting kit that is recommended for those seeking a top-quality finish. It includes a primer and a topcoat to ensure a long-lasting and durable paint job.
• Smootherite by Finnigans: This is a one-pack paint with rust inhibitors, making it ideal for preventative maintenance. It does not require a primer, and you can simply apply it to a grease-free engine.
• Marine-Grade Paint: Consider using marine-grade paint designed specifically for boats. Brands like Interlux, Awlgrip, and Duralux offer a range of topside and bottom paints for different parts of your boat. These paints are formulated to protect against saltwater corrosion and other environmental factors.
• Polyurethane Paint: Polyurethane paint is a common type of boat paint that offers a hard and glossy finish. It is available in one-part and two-part varieties. The one-part option is easier to apply and is suitable for various materials, while the two-part option is extremely durable but better suited for fiberglass.
• Enamel Paint: Enamel paint is less durable than polyurethane but is a good choice for wooden boats. It is flexible and can expand and contract with the wood, reducing the likelihood of cracking.

Frequently asked questions