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Osmo UV Protection Oil Extra

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Osmo UV Protection Oil Extra is a superior wood oil that protects timber against the greying effect of the Sun's UV rays by a factor of 12. It offers superb durability against weathering with an added biocide to combat insect attack and fungal growth.

Easily applied with a paint brush or velour roller. Available in clear or as two attractive colours, Cedar and Oak. Dries to a satin-matt finish that will not peel, flake or blister.

Can also be used for lightening or overcoating Osmo Natural Oil Wood Stain colours. Also available Osmo UV Protection Oil Extra Natural which helps retain the untreated appearance of timber.

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  • Overview

Osmo UV Protection Oil Overview

Osmo UV Protection Oil is available in clear (420) or coloured / pigmented variations including Cedar (428) and Oak (425).

Perfect for use on all exterior timber including external doors, window frames, windowsills, carports, timber cladding, balcony, screens & fences, pergolas, garden houses, furniture and more.

Osmo UV Protection Oil Extra has been designed to combat the greying effects of the Sun's UV rays on exterior wood. Can be applied to a wide range of exterior soft and hard woods including Pine, Larch, Teak, Oak and Bamboo.

Exterior timbers turn grey or silver over time as a result of exposure to the sun and rain. Osmo UV oil acts as a 'sun cream for wood' slowing the greying process by a factor of 12 when compared to untreated wood.

Osmo UV Protection Oil also contain Biocide which helps to protect timber from the onset of mould, algae and insect attack.

These UV Oils are micro-porous, thus allowing the wood to breathe. As the oil penetrates into the surface of the timber, it doesn't form a surface coating, so will not crack, peel, flake or blister. Osmo 420 clear and 425 Oak penetrate deep into the grain aiding the natural elasticity of the wood and helping to reduce shrinkage and swelling.

Osmo 420 clear & 425 Oak - Key Features

  • Based on natural, renewable resources
  • Final finish protects against mould, algae and fungai attack
  • Oiled finish provides a microporous, breathable surface
  • Foundation and top coat in one
  • For use on dimensionally/non dimensionally stable exterior wood
  • Dries in approximately 12 hours under normal conditions
  • 2.5Ltrs tin covers approximately 45 square meters based on 1 coat


Ensure surfaces to be oiled are clean, dry and free from all surface coatings such as paint or varnish before application. Wood that has been previously oiled should be cleaned and lightly sanded.

New unpreserved or old wood should first be treated with a quality wood preservative such as Barrettine Wood Preservative or Ronseal Total Wood Preservative before applying Osmo UV Protection Oil. Using a wood preserver prior to applying the oil gives additional protection against mould, algae, dry rot, woodworm and other wood boring insects. Allow sufficient time for the preservative to dry, normally 24 to 48 hours, before applying 'Osmo 420 Clear' or 'Osmo 425 Oak'.

As an alternative to spirit based preservatives Osmo WR Base Coat 4005 can be used. This product penetrates deeply into the wood to help repel water and moisture. This helps to reduce the risk of timber swelling and shrinking therefore reducing the chance of the wood cracking, splitting and warping. Note: this product does not contain an active insecticide.


Apply in thin coats with a paint brush or velour roller ensuring that the oil is worked into the grain of the wood as opposed to painted on top of the wood. Always finish your brush or roller strokes by going in the direction of the wood grain. Osmo UV Protection Oil Extra 420 can also be applied over Osmo Natural Oil Woodstain as a top coat for added protection and durability.


Slightly tired looking areas can be easily refreshed by simply cleaning the affected areas and applying a fresh coat of Osmo UV Oil. Even badly scratched areas can be seamlessly repaired with a light sanding and a re-application of the oil.

Equipment Cleaning

Application brushes and other equipment should be cleaned with Osmo Brush Cleaner or White Spirit.


Osmo UV Protection Oil Extra has a shelf life of 5 years or more if kept sealed in the original tin. Store in a dry cool place. If thickened by cool temperatures or frost, the oil will regain its normal consistency within 24 to 36 hours of being returned to normal temperatures.

To preserve any remaining oil once the tin has been opened and used, decant any remaining oil into a smaller tin, jar or container, fill to the rim and seal with an air tight lid.


Osmo recommends that this product is NOT used on horizontal surfaces where water can collect such as floors, decking and wooden steps etc.


Q. We have a garden table which says only use Roble Wax and not Linseed Oil. I have searched for this product and even with the Internet I have not succeeded. The table was from B&Q. Please can you help me?

A. To my knowledge, it's only B&Q that offers the Roble garden furniture in The UK and the product recommended for finishing it is indeed hard to find. We have looked into this thoroughly and can confirm that Osmo's UV Protection Oil is ideal for Roble wood. As Roble is a dense, oily wood it is important to work the oil into the wood well and apply it thinly.

Q. I work for a joinery that makes and fits bespoke hardwood windows, doors and decking. Can Osmo UV Protection Oil be used on dense exotic hardwoods like Teak, Iroko, Ipe, Meranti and Garapa?

A. On the tin it states that Osmo UV Protection Oil Extra is not suitable for use on Iroko, Teak and other exotic hardwood timbers but we have customers that have used Osmo UV Protection Oil with success on these woods.

Lightly sanding with a 120 grit sandpaper helps to open the tighter, less porous grain of exotic hardwoods enabling the oil to penetrate easier. Wiping the timber down with methylated spirit prior to applying Osmo UV Oil can help to remove some of the natural oil from the surface of the wood which helps the Osmo Oil to penetrate. Ensure the oil is at a good room temperature as it thickens when cooler making application more difficult. Apply thinly working the oil into the surface grain of the wood.

Q. Can Osmo UV Protection Oil 420 Clear be used on garden decking?

A. Osmo says that this product isn't suitable for use on horizontal surfaces such as decking. This said however, we have customers that have applied one coat of Osmo Decking Oil then applied 2 very thin coats of Osmo 420 clear on top and have been happy with the results.

Drying Time

Osmo UV Protection wood oil dries in approximately 12 hours in normal climatic conditions of 23℃ / 50% relative humidity. Lower temperatures and higher humidity can increase the drying time.

  • Reviews

Osmo UV Protection Oil Extra reviews - Rating: 4.8 out of 5 stars, based on 236 reviews.

Filter:   All reviews (236)   5 stars (196)   4 stars (35)   3 stars (3)   2 stars (1)   1 star (1)  

M P Reynolds
 750ml, Clear - 420 Extra
Excellent product,easy to use & little clean up time
Used to refurbish a sad looking garden bench (grey) brought back rich deep colour after 2 coats cannot praise the product highly enough. After being rained on the bench looks like when you have waxed your car with the "bobbles" of water.
Mike Thomas
 2.5L, Clear - 420 Extra
Used many years ago for wooden flooring as was very impressed with finish and durability. The recent order was shipped to the Philippines for our property there, so haven't used yet. We ordered in the UK because OSMO products not available in Philippines.
The quality and performance of OSMO products mean that they are our first choice for bringing out the real beauty of wood as well as providing a very durable finish. The fact that they are made from natural oils and waxes was a major factor in the choice to use them. We will certainly be using OSMO natural oil finishes in the future.
Pete Bean
 750ml, Oak - 425 Extra
I would buy a dark oak rather than this one...may have to look at other brands.
I would buy a dark oak rather than this one...may have to look at other brands.
Our feedback:-

Thank you for your review. I'm sorry the colour wasn't quite what you were tring to acheive. OSMO do not make this product in Dark Oak so you could use a Dark Brown Wood Preserver under it to enhance the colour.
Kind regards.
Wood FInishes Direct.
Stuart Brown
 5ml Sample, Clear - 420 Extra
Excellent product, easy to apply and has protected my larch cladding
This product is easy to apply and leaves a nice satin finish on my exterior larch cladding.
Lynnette Watson
 2.5L, Clear - 420 Extra
Fantastic product
Used this on oak pillars and oak sleepers and was very happy with the result. Brought the grain out beautifully and has protected them to boot.
Pete Bramley
 2.5L, Oak - 425 Extra
Good coverage and easy application
Tim Burrows
 750ml, Clear - 420 Extra
Brushes on great
Goes on great! Not too strong smelling..hope it performs just aswell when the door is open to the elements
Roy Davies
 750ml, Clear - 420 Extra
Provides excellent coverage and a superb finish.
Tony Westcott
 2.5L, Clear - 420 Extra
Excellent product
Gives a very transparent finish to wood without darkening or yellowing effects; very good coverage. Wortrh paying a bit extra for.
Lorraine Johnstone
 2.5L, Cedar - 428 Extra
Very strong colour
thye ceadr colour is very strong - rather like putting fake tan on the fence. We had previously used the clear Osmo UVP rotection oil but after 12months the colour on the south facing fence was starting to fade. Have now applied the cedar coloured product but the colour is too strong (hopefully it will fade). Next time I will try and mix clar:cedar 50:50
Our feedback:-

I'm sorry that you weren't happy with the colour. I would recommend mixing the clear and the cedar if you want to acheive a lighter colour.
Derrick Conway
 750ml, Oak - 425 Extra
Good finish
Used this oil on oak after first applying Barrettine wood preservitive. The oil finish now looks brilliant
 2.5L, Clear - 420 Extra
I have put two coats of oil on our new oak garage doors and the colour has been lifted. They look absolutely beautiful.
Stella Swindell
 125ml, Clear - 420 Extra
Enhances oak beautifully.
Used this to protect the wooden oak frame surrounding my door and porch. Following the advice onsite, I used base coat of Barrentine's wood preservative first. I found the oil very easy to apply, using a small mako brush. I doubted the 125ml tin can would do the job, but It spread well and I managed to do 2 coats with some over. The oak looks beautiful and I am very pleased . Neighbours have commented on how good it looks- not bad for 80 year old wood!
Chris Davies
 2.5L, Clear - 420 Extra
OSMO oil is amazing
The best finish I have ever used on wood! I have an oak framed house and this stuff is fantastic!
F Hammond
 2.5L, Clear - 420 Extra
Easy to apply with great results!
Easy to apply with great results!
David Stedman
 750ml, Clear - 420 Extra
Easy to use
Used over Barrettine Premier Clear Preservative. As with the preservative it was easy to apply and the water just runs of the surface. So far so good!
G Saunders
 2.5L, Clear - 420 Extra
Certainly appears to perform as it should. The wood looks great.
Scott Keetley
 2.5L, Clear - 420 Extra
Brilliant stuff. Does exactly what it says on the tin....
Brings the grain out lovely. Used it on all my oak doors. Brilliant stuff...
Daniel Varga
 2.5L, Oak - 425 Extra
Excellent product
Excellent product. Best you can get for your outdoor hardwood furniture.
Chris McCall
 2.5L, Clear - 420 Extra
Excellent product
Very easy to apply, covers a large area relative to the amount used and leaves a lovely finish on the wood.

per litre
12 hours
dry time
  • Protects against greying
  • UV-Protection factor 12
  • Will not peel or flake

Coverage Calculator

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* Coverage can vary depending upon on the type of wood used and the amount of product applied. Litreage amounts shown above are total, not 'per coat' amounts.
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