UV-Protection Oil for exterior wood – clear, Natural and transparent wood colours

Osmo UV-Protection Oil – clear and transparent wood colours

Protect exterior wood while keeping its character

Looking after timber cladding, a pergola or a wooden garden structure does not have to mean hiding the grain. Osmo UV-Protection Oil provides a water-repellent, microporous finish and slows the greying caused by sunlight.

Choose a clear version or a transparent tint. The original wood colour remains an important part of the finished appearance.

Which version should you choose?

410 – Clear
A satin UV-protective finish without biocidal film protection. It enhances the natural colour of the wood. This version is not solvent-free.

420 Extra – Clear
A satin UV-protective finish containing an active ingredient that helps protect the coating against mould, algae and fungal growth. The clear oil usually gives wood a warmer, deeper colour.

429 Natural
Lightly white-pigmented to reduce the darkening effect on pale wood. Natural is therefore not completely clear. Dark or reddish wood, or heavy application, can produce a whitish appearance.

Transparent wood colours
These versions add colour while allowing the grain to remain visible:

• 424: Spruce.

• 425: Oak.

• 426: Larch.

• 427: Douglas Fir.

• 428: Red Cedar.

• 431: Light Red Cedar.

• 432: Light Oak.

The colour name identifies the tint. Wood species, preparation and application amount also influence the result. Always carry out a trial application first.

Designed for vertical exterior wood

Suitable applications include timber cladding, exterior faces of wooden doors and window frames, shutters, fences, pergolas, carports and garden sheds.

Use it where rainwater can drain away effectively. For walked-on decking and other heavily exposed horizontal surfaces, select a finish specifically intended for that application.

Understanding UV protection factor 12

With two correctly applied coats on vertical wood, Osmo states that the finish delays greying by a factor of 12 compared with untreated wood.

This does not mean maintenance-free protection. Exposure, sunlight, rainfall, wood species and construction all affect the maintenance interval.

Preparing the surface

• Wood must be clean, dry and frost-free, with a moisture content of no more than 20%.

• Completely remove old paint and varnish coatings.

• Thoroughly clean suitable existing microporous finishes.

• Treat greyed wood beforehand with Osmo Wood Reviver Power-Gel.

• Do not sand smooth wood finer than P120, so it retains sufficient absorbency.

Fresh, extractive-rich or particularly hard timber may need to weather before treatment. Osmo gives approximately six weeks as guidance. Adapt preparation to the particular wood species.

How to apply UV-Protection Oil

1. Stir thoroughly before use. Do not dilute.

2. Apply a thin, even coat with a suitable brush or microfibre roller.

3. Spread carefully along the grain, treating edges and rounded areas as well.

4. Allow the first coat to dry before applying the second.

5. For maintenance of an intact, compatible finish, one thin coat is usually sufficient.

Apply two coats to bare wood according to the instructions for your chosen version. Take particular care with 429 Natural: spread evenly and avoid accumulations of white pigment.

Drying time and coverage

• Drying time: approximately 12 hours per coat under normal conditions with good ventilation.

• Coverage: approximately 18 m² per litre per coat on smooth, planed or sanded wood.

• Two coats: allow approximately 9 m² of finished surface per litre as a planning estimate.

Cold or humid conditions and excessive application extend drying. Rough or highly absorbent timber may require more oil.

Maintenance and safe handling

Inspect the finish at least annually, particularly on weather-facing sides. Clean and recoat when the condition of the surface requires it.

Extra versions contain biocidal film protection and are intended for exterior use only. Protection of the coating does not replace a wood-preservative treatment against rot.

Oil-soaked cloths can self-ignite. Do not leave them crumpled together. Spread them individually on a safe, non-combustible surface after use and follow the label and safety data sheet for subsequent handling.

Avoid release into the environment, keep out of reach of children and use suitable protection. Extra versions may cause an allergic reaction.

Official product information and safety data

Technical information and safety

• Osmo UV-Protection-Oil 410 – Product information (PDF)

• Osmo UV-Protection-Oil 410 – Safety data sheet (PDF)

• Osmo UV-Protection-Oil Extra 420 and coloured finishes – Product information (PDF)

• Osmo UV-Protection-Oil Extra 420 and coloured finishes – Safety data sheet (PDF)