Osmo UV-Protection Oil Extra – Clear Exterior Wood Oil

Clear Protection for Vertical Exterior Timber

Osmo UV-Protection Oil Extra is designed specifically for vertical exterior wood. Vertical surfaces shed water more readily than horizontal decking, allowing the clear oil system to provide long-lasting protection while keeping the timber grain and natural colour visible.

It can be used either as a standalone clear finish or as a clear final coat over compatible coloured Osmo exterior treatments to help extend the interval between maintenance coats.

Why Choose Osmo UV-Protection Oil Extra?

• Clear exterior protection for vertical timber surfaces
• UV-protection factor up to 12 with a complete two-coat system
• Helps slow the natural greying process
• Contains active ingredients against mould, algae and fungal attack
• Highly water-repellent and weather-resistant
• Microporous and breathable
• Helps reduce swelling and shrinkage
• Will not crack, peel, flake or blister
• Suitable for exterior doors, windows and shutters
• Suitable for cladding, fences, pergolas and summerhouses
• Suitable as a clear topcoat over compatible coloured exterior finishes
• Easy to maintain without complete sanding
• Normally requires two thin coats on bare timber
• Normally requires one thin coat for renovation
• Available in clear satin and clear matt finishes
• Available in 0.75L and 2.5L sizes

UV-Protection Oil vs UV-Protection Oil Extra

Choose Your Finish

Which Osmo Exterior Product Is Right for Me?

Suitable Surfaces

• Exterior wooden doors
• Window frames
• Window shutters
• Timber cladding
• Weatherboarding
• Fencing
• Privacy screens
• Pergolas
• Carports
• Balcony balustrades
• Summerhouses
• Garden buildings
• Timber façades
• Vertical timber panels
• Previously Osmo-treated vertical timber following suitable preparation

Suitable Timber Species

Timber species, treatment chemicals, natural oils and moisture content can all affect absorption and drying. Always complete a representative trial before coating the full area.

Using UV-Protection Oil Extra as a Clear Topcoat

UV-Protection Oil Extra can be used as a clear final coat over compatible Osmo exterior colour treatments to extend the maintenance interval while allowing the underlying colour to remain visible.

Cleaning and Reviving Existing Timber

Recommended Application Tools

Recommended Accessories

Available Sizes

Coverage is based on approximately 18m² per litre for one thin coat on smooth, prepared timber. Rough-sawn, weathered, textured or highly absorbent surfaces may use more product.

Technical Information

Coverage and drying times are approximate. Timber species, porosity, texture, preparation, temperature, humidity, ventilation and application thickness will affect the result.

Best Conditions for Application

• Apply to clean, dry and frost-free timber.
• Timber moisture content must not exceed approximately 20%.
• Choose a dry weather window with no rain forecast during drying.
• Avoid application in direct intense sunlight.
• Do not apply to timber that is excessively hot.
• Avoid application during frost, heavy dew or high humidity.
• Provide good airflow while each coat dries.
• Allow each coat to dry completely before recoating.

Surface Preparation

• Ensure the timber is clean, dry, frost-free and free from grease, dirt, algae and contamination.
• Timber moisture content must be below approximately 20%.
• Allow ingredient-rich, resinous or pressure-treated timber to weather sufficiently before coating.
• Clean sound old microporous Osmo finishes thoroughly before renovation.
• Lightly sand weathered or uneven coatings where necessary.
• Remove paint, varnish, lacquer and incompatible film-forming finishes completely.
• Revive greyed timber using Osmo Wood Reviver Power-Gel .
• Clean organic contamination using the appropriate exterior cleaner.
• Round sharp exterior edges to a radius greater than approximately 2mm where practical.
• Ensure horizontal details attached to vertical timber have sufficient fall to shed water.
• Vacuum or brush away all sanding dust.
• Stir the product thoroughly before and during application.
• Complete a representative trial before coating the full area.

How to Apply UV-Protection Oil Extra

1. Confirm that the timber is clean, dry and ready to absorb oil.
2. Stir the product thoroughly. Do not thin.
3. Apply the first coat exceptionally thinly with an Osmo Flat Brush or suitable microfibre roller.
4. Work with the grain and spread the product evenly.
5. Complete individual boards, doors or panels from end to end wherever possible.
6. Maintain a wet edge and avoid heavy overlaps.
7. Check corners, rebates, joints and lower edges for runs or pooled product.
8. Redistribute all visible excess before allowing the coating to dry.
9. Allow approximately 12 hours’ drying with good ventilation.
10. Once the first coat is fully dry, apply a second equally thin coat.
11. Protect the timber from rain, dew and contamination throughout drying.

Renovating an Existing Finish

1. Inspect the existing coating for wear, greying, mould and contamination.
2. Clean the surface thoroughly.
3. Treat greyed timber with Wood Reviver Power-Gel where required.
4. Allow the timber to dry completely.
5. Lightly sand loose, rough or uneven areas.
6. Remove all dust.
7. Apply one exceptionally thin coat of the matching finish where the existing coating remains sound.
8. Where the timber has become bare or heavily weathered, apply a complete two-coat system.
9. Maintain good ventilation and protect from rain while drying.

Cleaning and Maintenance

Important Application Notes

• Use on suitable vertical exterior timber only.
• Do not use as the primary finish for horizontal decking.
• Use UV-Protection Oil Extra outside only.
• Apply two exceptionally thin coats to bare timber.
• One thin coat is normally sufficient for renovation where the existing finish remains sound.
• Stir thoroughly before and throughout application.
• Do not thin the product.
• Timber moisture content must not exceed approximately 20%.
• Two clear coats are required to achieve the stated UV-protection factor.
• Heavy application can cause runs, tackiness and prolonged drying.
• Allow approximately 12 hours between coats under suitable conditions.
• Protect the finish from rain and dew while drying.
• Allow ingredient-rich timber to weather before coating.
• Consider WR Base Coat for suitable softwoods and modified timber.
• Remove paint, varnish and lacquer completely before application.
• Always complete a representative test area.
• Use Wood Reviver Power-Gel where the natural greying process has already begun.
• Recoat before the existing protection has worn away completely.

Tool Cleaning

Clean suitable brushes, rollers and reusable application equipment immediately after use with Osmo Brush Cleaner & Thinner .

Complete Your Osmo Exterior System