
Diesel fuel is a petroleum-based solvent that can be used to treat wood. It is often used as a wood preservative in roof constructions or where the appearance of the wood is not a concern. Diesel fuel is typically applied with a brush, sponge, or cloth and is an alternative to permethrin-IPBC mixtures. It is also used to treat wood against fungi and insects. In addition to its preservative properties, diesel can be used to create a wood stain by mixing it with linseed oil and a dye or tar. This mixture is then applied to the wood, where it is quickly absorbed, enhancing the grain of the wood.
| Characteristics | Values |
|---|---|
| Use | Wood preservative |
| Use | Wood stain |
| Application | Brush |
| Application | Sponge or cloth |
| Application | Spray |
| Mixture | 1:10 diesel to linseed oil |
| Mixture | 1:1 diesel to motor oil or transmission fluid |
| Mixture | 1:3.33 diesel to copper naphthenate |
| Mixture | 1:1.33 diesel to borax |
| Mixture | 4:1 diesel to linseed oil |
| Reapplication | Every few years |
| Disadvantages | Strong smell |
| Disadvantages | Fire risk |
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What You'll Learn

Diesel fuel as a wood preservative
Diesel fuel is an effective wood preservative, especially for outdoor use. It can be applied to wood using a brush, sponge, or cloth, and is a suitable alternative to widely marketed permethrin-IPBC mixtures. While diesel fuel is effective in preserving wood, it is crucial to consider its potential drawbacks, such as an unpleasant odour and safety concerns.
Benefits of Using Diesel Fuel
Diesel fuel offers several advantages as a wood preservative:
- It is readily available and easy to use.
- It is inexpensive compared to other wood treatment options.
- Diesel fuel is an excellent wood preservative for outdoor use, as it helps protect wood from the elements, moisture, and insects.
- When mixed with other substances like linseed oil, it can enhance the colour and appearance of the wood.
Mixtures and Application
To use diesel fuel as a wood preservative, it is often mixed with other substances to improve its effectiveness and aesthetic qualities:
- Diesel and Linseed Oil: Mixing diesel with linseed oil is a popular method. The recommended ratio is one part linseed oil to ten parts diesel. This mixture can be applied to the wood using a brush, sponge, or cloth.
- Diesel, Linseed Oil, and Dye or Tar: For added colour and preservation, some people add roofing tar or oil-based dyes to the diesel and linseed oil mixture. It is important to follow the manufacturer's instructions when using oil-based dyes.
- Diesel and Borax: Borax is a compound of boron and oxygen that resists beetles, termites, and fungi. Mixing borax with diesel provides an effective wood treatment. One recipe calls for one and one-third cups of borax to be mixed with one quart of water, and this solution is then painted onto the wood in up to three coats. An acrylic sealant can be applied over the borax treatment to seal out moisture.
- Diesel and Copper Naphthenate: Copper naphthenate is a wood preservative that works well with diesel fuel. Mix one quart of copper naphthenate with three and one-third quarts of diesel to dilute the copper concentration to 2%. Brush two coats of this mixture onto the wood, allowing each coat to dry before adding another. This treatment is suitable only for outdoor use and for wood surfaces above the ground.
Precautions and Considerations
While diesel fuel can be effective as a wood preservative, there are some important precautions and considerations to keep in mind:
- Odour: Diesel fuel can have a strong and unpleasant odour, as mentioned by several users. It may take a while for the smell to dissipate after application.
- Safety: Diesel fuel is a flammable substance, and proper precautions must be taken during application and storage.
- Appearance: Diesel fuel is typically used in applications where the appearance of the wood is not a primary concern, such as roof constructions. It may not be suitable for more aesthetically focused projects.
- Reapplication: Depending on the specific use case, diesel fuel treatments may need to be reapplied periodically to maintain their effectiveness.
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Diesel and borax to treat wood
Wood is a renewable resource that, when treated properly, can last a lifetime with minimal decomposition and little need for replacement. Wood decays when moisture or insects attack it, allowing further breakdown by fungi and bacteria.
Using borax and diesel to treat wood is a way to protect lumber with readily available and easy-to-use ingredients. They are both inexpensive and have specific advantages, depending on the use of the wood. Borax is a compound of boron and oxygen, and resists beetles, termites and fungi. It is odourless and colourless and does not change the colour of the wood. It is minimally toxic to mammals and should only be used outdoors.
To treat wood with borax, add one and one-third cups of borax to one quart of water in a metal mixing container. Treat the wood by painting up to three coats of the borax solution, allowing each coat to dry before applying another coat. To seal out moisture, apply a coat of acrylic sealant over the borax.
Mix one quart of copper naphthenate with three and one-third quarts of diesel. Copper naphthenate is a preservative that requires an oil-based solvent as a carrier medium and works very well with diesel fuel. Brush on two coats of the solution, allowing each coat to dry before adding another. Apply only to wood surfaces above the ground, such as poles, fences, steps or decorative timber. Wear protective gloves and a facemask while applying. This solution is also only suitable for outdoor use.
In the past, diesel fuel was also used as a wood preservative in roof constructions or where the appearance of the wood was not a matter of concern. It was brush-applied to the wood as an alternative to permethrin-IPBC mixtures. It was also used for treatment against fungi and insects. However, there is a lack of clear and reliable documentation on this practice. Diesel fuel was also used in the early 1980s in Cook, South Australia, to wipe the floors of wooden houses, but its use was discontinued after one of the houses caught fire.
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Diesel as a wood stain
Diesel fuel is a petroleum-based solvent used to stain and preserve wood for outdoor use. It is an excellent wood preservative, and the wood quickly absorbs diesel-based stains. Diesel fuel is an alternative to the widely marketed Permethrin-IPBC mixtures and is used for treating fungi and insects.
How to Make a Diesel-Based Wood Stain
To make a diesel-based wood stain, you will need diesel, linseed oil, and dye or roofing tar. First, measure out the boiled linseed oil and diesel in a 1:10 ratio by volume. Next, pour the diesel into a metal container, add the linseed oil, and stir until the liquids are thoroughly mixed. If you are using roofing tar, add the same volume as the linseed oil and stir until blended. You can also use oil-based dyes, following the manufacturer's instructions for adding them to the diesel and linseed oil solvent.
Applying the Stain
Before staining, test the stain on a spare piece of wood. Ensure that any oil-based dye that settles at the bottom of the container is well-stirred. Apply the stain to the wood using a brush, sponge, or cloth. If using a brush, wash it with white spirit after staining. The final product is sticky and never hardens, so it is important to allow sufficient drying time.
Other Diesel-Based Wood Treatments
In addition to diesel-based stains, diesel can also be used in combination with other ingredients for wood treatment. One such treatment is a mixture of diesel and borax, which helps resist beetles, termites, and fungi. Another treatment is a mixture of diesel and copper naphthenate, a preservative that requires an oil-based solvent as a carrier medium. This mixture is suitable only for outdoor use and should be applied above the ground to surfaces such as poles, fences, steps, or decorative timber.
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Diesel and motor oil for wood treatment
Diesel fuel is an effective wood preservative and is commonly used in roof constructions or where the appearance of the wood is not a concern. It is brushed onto the wood as an alternative to permethrin-IPBC mixtures. Diesel fuel is also used to treat fungi and insects. However, it is important to note that diesel-soaked wood can be highly flammable, as observed in an incident in Cook, Australia, in the early 1980s.
Motor oil, on the other hand, will continuously soak into the wood and stabilize it, likely preventing rotting. A mixture of diesel fuel and motor oil or transmission fluid is sometimes used for deck treatment, with a ratio of 50:50, depending on the desired tint. This mixture is sprayed liberally onto the deck and needs to be reapplied every few years when the colour fades.
To create a wood stain using diesel, mix boiled linseed oil and diesel in a 1:10 ratio by volume. Then, add roofing tar in the same amount as the linseed oil and mix until all the compounds are blended. This mixture can be applied to the wood using a brush, sponge, or cloth. It is important to test the stain on a spare piece of wood first and to ensure proper ventilation during the staining process.
Additionally, diesel and borax can be used together to treat wood. Borax is a compound of boron and oxygen that resists beetles, termites, and fungi. It is odourless, colourless, and minimally toxic to mammals. To treat wood with borax and diesel, mix one and one-third cups of borax with one quart of water in a metal container. Apply up to three coats of the borax solution, allowing each coat to dry before applying the next. An acrylic sealant can be applied over the borax to seal out moisture.
Copper naphthenate, a wood preservative, can also be mixed with diesel. Combine one quart of copper naphthenate with three and one-third quarts of diesel to dilute the copper concentration to 2%. Brush two coats of this mixture onto the wood, ensuring each coat dries before adding the next. This treatment is only suitable for outdoor use and above-ground wood surfaces such as poles, fences, steps, or decorative timber.
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Diesel fuel for roof constructions
Diesel fuel can be used as a wood preservative in roof constructions or where the appearance of the wood is not a concern. It is applied by brushing it onto the wood as an alternative to permethrin-IPBC mixtures. It is also used to treat wood against fungi and insects.
While diesel alone is not a good wood preservation agent, it is an effective carrier medium for other preservatives. It is best used with CuN, but linseed oil is also a viable option. To create the mixture, pour 3 1/3 quarts of diesel fuel and 1 quart of CuN into a metallic can. This ratio achieves the recommended CuN concentration of 2%. Once mixed, use a brush or sponge to gently apply the mixture to the wood's surface. It is important to note that this solution should not come into contact with plants, drinking water, or food. It also has a strong odor, even after drying.
There are some concerns about using diesel fuel as a wood preservative. One user recalled an incident where a house with diesel-soaked floors caught fire, and the diesel-soaked insulation contributed to the fire's spread. Additionally, diesel fuel is toxic and can be harmful to people, animals, soil, and water.
In recent years, the use of diesel fuel as a wood treatment has declined due to environmental concerns and the availability of alternative preservatives. For example, sump oil, a byproduct of diesel engines, was commonly used as a wood preservative in the past. However, it required frequent reapplication and had a negative impact on the environment.
Overall, while diesel fuel can be used as a wood preservative in roof constructions, it is important to carefully consider the potential risks and environmental impact before using it.
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Frequently asked questions
Yes, diesel fuel can be used to treat wood. It is used as a wood preservative in roof constructions or where the appearance of the wood is not a matter. It is also used for treatment against fungi and insects.
Diesel fuel can be brush applied on the wood. It can also be applied using a sponge or cloth.
Diesel fuel can be sticky and may not harden. It can also have a strong smell. There is also a risk of fire when using diesel fuel to treat wood.
Yes, there are several alternatives to using diesel fuel to treat wood. Some alternatives include using motor oil, sump oil, borax, and copper naphthenate.








































