Osmo UV Protection Oil Extra – 420 Clear Satin


Osmo Uv Protection oil extra (420), is ideal for protection against the sun. This clear, satin wood finish is based on natural oil ingredients for UV protection on outdoors exterior wood.

  • The Micro porous surface allows the wood to breathe and reduces swelling and shrinkage
  • It is water-repellent, will not crack, peel or flake
  • It blocks the greying process on vertical surfaces
  • Protects against mould, algae and fungal attack
  • Simply apply without sanding
  • Used on doors, windows, shutters, carports, timber cladding, balconies, fences, pergolas & summer houses
  • We now offer the full range of Osmo UV protection oil tints, with a wide variety of colours here.

See Full instructions below 

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Osmo Uv Protection oil extra, clear satin is ideal for protection against the sun. It is the first clear UV protection for the outdoors. This clear, satin wood finish is based on natural oil for wood in outdoor exterior woods. The Micro porous surface allows the wood to breathe and reduces swelling and shrinkage. It is water-repellent, will not crack, peel or flake. As a top coat on already colour treated wood, Osmo Uv-Protection oil prolongs the renovation intervals significantly. As a single product application, it blocks the greying process on vertical surfaces with a UV protection factor 12 in comparison to untreated wood when two coats are applied. Osmo UV Protection Oil Extra is furnished with active ingredients to protect the coating against mould, algae and fungal attack. Simply apply without sanding. It is easy and seamless application and the finish stays workable while coating.

Osmo UV-Protection Oil Extra is ideal for all vertical wood surfaces in outdoor areas: doors, windows, window shutters (dimensionally stable elements), carports, timber cladding, balconies, fences, pergolas, and summer houses (dimensionally unstable elements). It is also suitable for bamboo poles (e.g. in screens). It is based on natural plant oils (sunflower oil, soya oil, thistle oil and linseed oil), siccatives (drying agents) and additives, biocidal active ingredient: Propiconazole. Dearomatized white spirit (benzene-free).

We now offer the full range of Osmo UV protection oil tints, with a wide variety of colours here.

How to use Osmo UV Protection Oil Extra – 420 Clear Satin
Cleaning and Maintenance
Product Video
Please Note
Questions and Answers
Health and Safety
Safety Data Sheets

How to use Osmo UV Protection Oil Extra – 420 Clear Satin

  1. The wood surface must be clean, dry and frost-free (moisture content max. 20%).
  2. Osmo Uv Protection oil is ready to use. Do not thin.
  3. Stir well before use.
  4. If possible, please apply the first coat to all sides before installation.
  5. Fresh wood, containing natural wood extractives and especially hard wood needs to weather off (for approximately 6 weeks) after installation. Thereby the wood becomes absorbent and the wood finish adheres optimally.
  6. A coloured base can be used, e.g. Natural Oil Woodstain or Osmo UV protection oil tints.
  7. For renovations, clean old micro-porous wood finishes thoroughly. De-grey and clean any already greyed wood with Osmo Wood Reviver Power Gel. Clean old micro-porous stains thoroughly.
  8. Old paints and lacquers must be completely removed.
  9. As a general rule, wear a dust mask during sanding works.
  10. Do not sand smooth surfaces finer than P120.
  11. The finished surface is influenced by several factors, including the condition of the wood. Therefore, a trial application is always required, especially for unfamiliar surfaces.
  12. If additional protection against blue stain, rot and insects is desired, pre-treat the wood if possible on all sides with Osmo WR Base Coat.
  13. Apply with Osmo Flat Brush and apply thinly along the wood grain and spread well.
  14. Allow to dry for approx. 12 hours under good ventilation.
  15. Then apply the second coat.
  16. When re-coating colour treated surfaces, or for renovation works, one coat applied to the clean and dry surface is usually sufficient.

Cleaning and Maintenance

Depending on how weathered your wood gets,  it is recommended to re-apply a coat of Osmo UV Protection Oil every 2 – 3 years. In heavily weathered areas, it is recommended to apply yearly. If any wood is looking worn or needs renovation, lightly sand the wood. Ensure you clean away any dirt or grime. Apply a thin coat of Osmo UV Oil, over the lightly sanded area and surrounding wood. Wipe away any excess oil and allow it to dry. Then continue with your usual treatment routine. Only apply in warm dry conditions. Always follow Osmos instructions to achieve best results and test a small area for suitability

Product Video

Please note

  • Clean tools with Osmo Brush Cleaner (free of aromatic compounds).
  • DRYING TIME Approx. 12 hours (normal climatic conditions, 23 °C/ 50 % rel. humidity). Lower temperatures and/or higher air humidity can increase the drying time. Ventilate well while drying.
  • 1 litre covers approx. 18 m² with one coat. Coverage depends significantly on the condition of the wood. All information refers to smooth and planed/ sanded surfaces. Other surfaces may lead to differences in coverage.
  • Oils enhance the natural tone of wood (permanent wet effect). Depending on the degree of weathering, apply one coat of Osmo UV-Protection-Oil Extra to the cleaned and intact finish after approx. 3-4 years.
  • For areas exposed to strong weathering, such as weatherboard, post caps or window sills, please expect significantly shorter renovation intervals.
  • Vertical elements mounted onto horizontal wood should have at least a 15 degree angle. Sharp edges must be rounded (radius > 2 mm).
  • If the greying process has already begun, de-grey the surface with Osmo Wood Reviver Power Gel and refinish with 2 coats of Osmo UV-Protection-Oil Extra.
  • To achieve the UV protection factor 12, it is necessary to apply 2 coats of UV-Protection-Oil Extra. With only one coat on untreated wood, the life of the coating is significantly shorter
  • Due to high oil content, the coating has a light yellowing effect when used as a top coat on white substrates. Therefore, we recommend using Natural Oil Woodstain 900 White as a top coat in such cases. Osmo Uv-Protection oil extra is furnished with biocides and therefore it is only to be used in outdoor areas. The added active ingredients delay or minimize the risk of algae and fungal attack.
  • For effective protection, two coats are to be carried out. In accordance with the latest technical research, permanent protection against algae and fungal attack cannot be provided.
  • Dispose of leftover product and completely emptied packaging according to local official guidelines (waste code number 08 01 11). Only completely emptied cans can be recycled.
  • STORAGE Up to 5 years and longer if can is kept dry and closed tightly. If thickened by frost, store for 24-36 hours at room temperature before use.

Questions and Answers

What wood can Osmo UV protection oil clear be used on?

You can apply Osmo UV protection oil 420 straight onto bare wood such as Oak, Beech, Ash, Alder and Birch.

For softer woods such as Pine, Spruce and Douglas Fir it is recommended to first apply a coat of WR Base coat as this will protect against wood rotting and wood staining fungi which is very common on soft wood.

For ingredient rich or oily wood species like Cedar, Iroko, Mahogany, Teak, Walnut, Ipe, Merbau, Wenge, Rosewood, Sycamore and Sapele it is best to leave for around 12 weeks before application of Osmo UV protection oil extra 420 clear. The weathering period will help to improve the absorbency of the wood so the oil will soak into the timber better.

Can you apply Osmo UV protection oil extra onto wood that has gone grey?

Some woods can grey over time due to weathering. If this is the case, then it is recommended to de-grey the wood with Osmo Wood Reviver Power Gel first. This will clean the wood, ready for application Osmo UV protection oil extra 420. You must ensure you completely remove all the Power Gel before application to ensure the oil soaks into the grain of the wood correctly. Osmo UV protection oil usually prevents greying by a factor of 12. The tinted version actually has a higher UV protection due to the additional pigments so is better at preventing this.

How long will Osmo UV protection oil extra clear last?

This really depends on how much weathering and rain your timber receives. It most cases you should re-apply the Osmo 420 clear UV protection oil every 3 years but for areas that receive a large amount of rain or strong wind, then it is recommended to re-coat once every year.  Also, on decorative areas such as exterior Oak doors and windows, it is recommended to treat yearly to ensure no damage or discolouration to your timber.

Can this wood oil be used on a wooden pergola?

Osmo UV protection oil extra is ideal for use on an exterior wooden pergola. It offers a water-resistant finish and enhance the colour of the natural timber. This will work on most exterior wooden structures along with fences, gates, garage doors and much more.

Can you use Osmo UV protection oil extra 420 clear on wood Decking?

You can use this wood oil on decking although Osmo Decking oil is a far better option. With Osmo Decking Oil you will get better protection as it is designed for higher traffic areas. The Decking Oil will enhance the natural wood and offer a water and dirt resistant finish. It also comes in a variety of tinted colours that protect against water logging, swelling and shrinkage.

Can I apply a clear finish whilst also providing UV-protection?

Yes, Osmo Uv protection will work on vertical wood surfaces like wood cladding and fencing etc. This Oil contains special properties that help to resists UV rays from sunlight to a factor of 12 compared to untreated wood. For horizontal wood surfaces, like decking or garden furniture, the rain can remain on the wood surface for long periods of time. This will reduce the UV resistance significantly over time. For a stronger form of UV is protection is the Osmo UV Oil tints have  additional pigment that provides more UV strength and protection on the timber. If you like the naturally greying effect that is created over time, then this finish is fine to use.

What’s the best finish for outdoor signs?

This all depends on your sign. Most Osmo exterior products are suitable, ranging from clear finishes to coloured finishes. Keep in mind that the UV-Protection Oil requires a minimum drip angle of 15°C to offer a suitable resistance.

Health and safety

Keep out of the reach of children. Do not get in eyes, on skin, or on clothing. Contains propiconazole. May produce an allergic reaction. If medical advice is need-ed, have product container or label at hand. Use only outdoors or in a well-ventilated area. Harmful to aquatic life with long lasting effects. Avoid release to the environment. Warning: Wash out any used cloth impregnated with this product immediately after use or store in an airtight container (danger of self-ignition). The dried finish is classified as B2 (normal flammability) according to DIN 4102 regulations. Safety data sheet available on request. TECHNICAL DATA Specific gravity: 0.9-1.0 g/cm³ Viscosity: >50s DIN EN ISO 2431/3 mm, viscid Odour: faint/mild, odourless after drying Flash point: >60 °C acc. DIN EN ISO 2719

Safety Data Sheets

Additional information

Weight N/A

Clear Satin 420 – 750ml, Clear Satin 420 – 2.5 Litres, Clear Satin 420 – 125ml, Clear Satin 420 – 2.5 Litres + 20% Extra *Special offer*


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