Osmo UV-Protection Oil 410 – Clear Exterior Wood Oil

Clear, Biocide-Free UV Protection

Osmo UV-Protection Oil 410 protects exterior timber without hiding its natural colour, knots or grain beneath an opaque coating. The finish remains microporous and breathable, allowing moisture vapour to move through the timber while helping to reduce swelling and shrinkage.

Unlike many film-forming exterior varnishes, it does not create a brittle layer that cracks, peels, flakes or blisters. When signs of weathering eventually become visible, the timber can normally be cleaned and refreshed without completely sanding away the existing finish.

Why Choose Osmo UV-Protection Oil 410?

• Clear UV protection for vertical exterior timber
• Slows natural greying by a factor of up to 12
• Biocide-free formulation
• Suitable where active film preservatives are not wanted
• Highly water-repellent and dirt-resistant
• Microporous and breathable
• Helps reduce swelling and shrinkage
• Will not crack, peel, flake or blister
• Enhances the timber grain with a clear satin appearance
• Suitable for exterior doors, windows and shutters
• Suitable for cladding, fencing and garden buildings
• Suitable for pergolas, carports and balconies
• Can be used as a clear final coat over compatible coloured finishes
• Easy to maintain without complete sanding
• Two thin coats recommended on bare timber
• Normally one thin coat required for maintenance
• Available in 0.75L and 2.5L tins

UV-Protection Oil 410 vs UV-Protection Oil Extra

Which Osmo Exterior Product Is Right for Me?

Clear Protection and Natural Colour Change

UV-Protection Oil 410 is clear and allows the original timber colour and grain to remain visible. However, clear oil creates a natural wet-look effect that enriches and normally darkens untreated timber slightly.

Clear Oil vs Transparent Colour

Suitable Surfaces

• Exterior wooden doors
• Window frames
• Window shutters
• Timber cladding
• Weatherboarding
• Exterior fencing
• Privacy screens
• Pergolas
• Carports
• Balcony balustrades
• Exterior gates
• Summerhouses
• Garden buildings
• Vertical timber façades
• Suitable wooden animal enclosures
• Previously Osmo-treated vertical timber after suitable preparation

Suitable Timber Species

Timber varies in resin, extractives, treatment chemicals and moisture. Always complete a representative trial before coating the full surface.

New Timber May Need to Weather First

New resinous and ingredient-rich exterior timber may contain natural oils, resin or treatment chemicals that prevent an exterior oil from penetrating and drying correctly.

Using WR Base Coat

On suitable untreated softwood, Osmo WR Base Coat can be applied before UV-Protection Oil 410 where additional protection against blue stain, rot and insect attack is required.

Using 410 as a Clear Topcoat

UV-Protection Oil 410 can also be used as a clear final coat over compatible coloured Osmo exterior finishes where a biocide-free topcoat is preferred.

1. Apply the selected compatible coloured exterior finish.
2. Allow the coloured coating to dry completely.
3. Test the clear topcoat to check colour and sheen changes.
4. Apply one exceptionally thin coat of UV-Protection Oil 410.
5. Spread evenly with the grain and remove all heavy deposits.
6. Protect the surface from rain and dew while drying.

Cleaning and Reviving Existing Exterior 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, textured, weathered or highly absorbent surfaces may use considerably more product.

Technical Information

Coverage and drying times are approximate. Timber species, porosity, texture, preparation, temperature, humidity, airflow and application thickness will influence 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 expected during drying.
• Avoid application in intense direct sunlight.
• Do not coat timber that is excessively hot.
• Avoid frost, heavy dew and very high humidity.
• Provide good airflow while each coat dries.
• Allow the first coat to dry completely before recoating.

Surface Preparation

• Ensure the wood is clean, dry, frost-free and free from dirt, grease, algae and contamination.
• Timber moisture content must be below approximately 20%.
• Allow new resinous, ingredient-rich or pressure-treated timber to weather until it becomes sufficiently absorbent.
• Thoroughly clean compatible old microporous coatings.
• Lightly sand worn, rough or uneven areas where necessary.
• Completely remove old paint, varnish, lacquer and incompatible film-forming coatings.
• Avoid sanding smooth exterior timber finer than approximately P120.
• Restore greyed timber with Osmo Wood Reviver Power-Gel .
• Consider Osmo WR Base Coat on suitable softwood where additional preservative protection is wanted.
• Round sharp exterior edges where practical so the coating can protect them more effectively.
• Ensure horizontal sections connected to vertical timber shed water correctly.
• Remove all sanding dust.
• Stir the oil thoroughly before and during application.
• Complete a representative trial before coating the full area.

How to Apply Osmo UV-Protection Oil 410

1. Confirm that the timber is clean, completely dry and ready to absorb oil.
2. Stir the product thoroughly from the bottom of the tin. Do not thin.
3. Cut in around edges, joints, frames and difficult areas with a suitable brush.
4. Apply the first coat exceptionally thinly using an Osmo Flat Brush or suitable microfibre roller.
5. Work along the timber grain and spread the oil thoroughly.
6. Complete individual boards, doors or panels from end to end wherever possible.
7. Maintain a wet edge and avoid heavy overlaps.
8. Check rebates, joints, lower edges and corners for runs or pooled oil.
9. Redistribute all visible excess before allowing the finish to dry.
10. Allow approximately 12 hours’ drying under suitable conditions.
11. Once the first coat is completely dry, apply a second equally thin coat.
12. Protect the surface from rain, dew, dust and contamination while drying.

Renovating an Existing Finish

1. Inspect the coating for dirt, fading, greying and localised failure.
2. Clean the timber thoroughly.
3. Use Wood Reviver Power-Gel where the wood has already greyed.
4. Allow the surface to dry completely.
5. Lightly sand loose, rough or uneven areas where required.
6. Remove all dust.
7. Apply one exceptionally thin coat where the existing finish remains sound.
8. Where the coating has worn away or the timber has become bare, apply a complete two-coat system.
9. Protect from rain and dew while drying.

When Should the Timber Be Recoated?

• The timber begins to look dry or faded.
• Water no longer beads effectively.
• South-facing areas become lighter than sheltered surfaces.
• The coating appears thin around edges or exposed sections.
• The finish remains intact but weather resistance is reducing.
• Natural greying begins to appear through the clear coating.

Important Application Notes

• Use on suitable vertical exterior timber.
• Do not use as the primary finish for horizontal decking.
• Apply two exceptionally thin coats to bare timber.
• One thin coat is normally sufficient for renovation where the existing coating remains sound.
• Stir thoroughly before and throughout application.
• Do not thin the product.
• Timber moisture content must not exceed approximately 20%.
• The stated UV protection requires a complete two-coat system.
• Clear oil will normally enrich and darken timber slightly.
• Heavy application can cause runs, stickiness and prolonged drying.
• Allow approximately 12 hours between coats.
• Protect the surface from rain and dew while drying.
• Allow ingredient-rich timber to weather before coating.
• Consider WR Base Coat on suitable softwood where additional protection is required.
• Remove paint, varnish and lacquer completely before application.
• Always complete a representative test area.
• Use Wood Reviver Power-Gel where timber has already become grey.
• Recoat before the existing protection wears 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