Tar oil dark (tar 30%)

TAR OILS

Tar oils are available as

a)     light, with a tar content of 10 percentage points.

b)    dark, with a tar content of 30 percentage points.

c)     tar glaze, with a tar content of 60 percentage points.

 

Applications and benefits of tar oil

Puijon Terva's Tar Oil is a natural wood preservative made from tar and boiled linseed oil, combining the protective properties of tar and the absorbency of linseed oil. It is particularly suitable for outdoor use, but also for interiors where a breathable and traditional surface treatment is desired.

🔹 Applications of tar oil and tar glaze

1. Protection and treatment of wooden structures

✅ Log houses and cabins – Protects against moisture, mold, and decaying fungi.
✅ Claddings and fences – Water-resistant and breathable protection for exterior walls.
✅ Wooden roofs and roofing felt – Prevents moss growth and slows down material degradation.
✅ Terraces and yard structures – Provides natural protection against weathering.

2. Boats and docks

✅ Wooden boats – Protects against water and keeps the wood flexible.
✅ Docks and wooden waterfront structures – Slows down decay and protects against UV radiation from the sun.

3. Yards and land areas

✅ Wooden fences and gates – Prevents decay and provides a naturally beautiful surface.
✅ Wooden posts and poles – Absorbs deep into the wood, preventing decay at ground level.

4. Interior treatment

✅ Floors and walls – Provides breathable protection, especially for old buildings.
✅ Furniture and wooden objects – Enhances the natural look of wood and protects the surface.
✅ Saunas and sauna benches – Use sparingly, as the scent of tar can be strong.

5. Hunting and animal care

✅ Skin protection for horses and cattle – Used for insect repellent and skin care.
✅ Hunting equipment (e.g., traps and wooden parts) – Provides weather protection and prevents mold growth.

🔹 Benefits of tar oil

1. Natural and ecological 🌿

✔️ Contains no harmful chemicals.
✔️ Breathable and biodegradable.

2. Protection against moisture, mold, and fungi 🛡️

✔️ Boiled linseed oil penetrates the wood and keeps it elastic.
✔️ Tar protects against mold and decaying fungi.
✔️ Slows down wood cracking and drying shrinkage.

3. Durable and long-lasting ⏳

✔️ Its deeply penetrating formula protects wood for years.
✔️ Reduces maintenance needs compared to traditional paints.

4. Good appearance and natural shade 🎨

✔️ Highlights the wood grain and provides a beautiful brown shade.
✔️ Patinates beautifully over time.

5. Easy to maintain and renew 🔧

✔️ No need to remove old treatment – a new layer of tar oil penetrates directly into the wood.
✔️ Does not chip or peel like paints.

 

Application of tar oil and painting conditions

Applying tar oil is relatively simple, but the right conditions and application methods ensure the best results. Here are instructions for applying tar oil and choosing suitable weather conditions.

🔹 Tar oil application instructions

1. Surface preparation

🔹 Clean the surface thoroughly – Remove dirt, dust, mold, and any old surface treatments (such as peeling paint).
🔹 Dry wood absorbs best – The wood to be treated must be dry for proper tar oil absorption.
🔹 Light sanding (if necessary) – Improves oil absorption, especially on smooth and planed wood surfaces.

2. Thinning of tar oil (if necessary)

Tar oil is naturally quite thick, so it can be thinned for better absorption:
✔️ Turpentine (5–20%) – Speeds up drying and improves absorption.
✔️ Linseed oil (10-20%) – Increases flexibility and reduces the risk of drying marks.
✔️ Heated tar oil – Slightly heated tar oil (approx. +40 °C) absorbs better without thinning. Heat, for example, in a hot water bath.

3. Application methods

✔️ Brush (recommended) – The best result is achieved using a wide natural bristle brush to rub the tar oil into the wood.
✔️ Rag or sponge – Suitable for small surfaces or finishing.
✔️ Sprayer (thinned only) – Possible, but the viscosity of tar oil may require significant thinning. We do not recommend using a sprayer.

Application technique:
✅ Apply a thin layer at a time – A thick layer dries slowly and tends to remain tacky.
✅ Rub into the wood – Rubbing with a brush or rag helps absorption.
✅ Allow the oil to absorb completely before the next coat – Usually 24–48 hours after the first application.

🔹 Painting conditions – when should tar oil be applied?

1. Temperature

✔️ +10...+25 °C is the ideal application temperature.
✔️ In too cold conditions (+5 °C or below), tar oil stiffens and does not absorb properly. Must be heated.
✔️ In too hot conditions (+30 °C or above), tar oil can evaporate too quickly and dry unevenly.

2. Humidity

✔️ A relative humidity of 40–70% is optimal.
✔️ Too dry air (below 30%) can cause too rapid drying and uneven absorption.
✔️ In too humid air (above 80%), the tar oil dries slowly and may remain sticky.

3. Weather conditions

✔️ Dry and cloudy weather is best – in direct sunlight, the tar oil can dry too quickly.
✔️ Avoid rain for the next 24 hours – Tar oil cannot withstand rain until it has been properly absorbed.
✔️ Avoid strong winds – Wind can dry the surface before the oil has time to properly penetrate the wood.

🔹 Drying and aftercare

⏳ Drying time depends on conditions, but typically:

• Surface dry in 1–3 days.
• Completely dry in 1–3 weeks.
• Drying may slow down in cool or humid weather.

🛠 A second coat (if needed) can be applied when the first is well absorbed, usually after 24–48 hours.