Osmo UV Protection Oil Extra

  302 customer reviews
Recommended 2 coats
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Wood type and application method can vary coverage. Litreage amounts shown above are total, not "per coat" amounts.

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  • 2
  • 20m²/L
    1 coat
  • 12 hrs
  •  Protects against greying
  •  UV-Protection factor 12
  •  Will not peel or flake
302 reviews

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 clear satin 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.

Be aware that rough sawn timber is more absorbent, meaning coverage per litre will be greatly reduced.

Please be advised that 125ml tins are printed in German only. For application instructions refer to the overview below.

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.

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.

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.

Osmo UV Protection Oil Extra reviews

Rating: 4.8 out of 5 stars, based on 302 reviews.
Filter:   All reviews (302)   5 stars (247)   4 stars (47)   3 stars (6)   2 stars (1)   1 star (1)  
Easy to use and a great result by Michael Hill

A 2.5 litre can covered 2 pairs of double gates and a single gate, all with posts with 2 coats and still a quarter of a can left. Excellent appearance and hopefully it will protect our hardwood gates as it says it does. Expensive, but would seem worth it.

Reviewed 2.5L, Clear - 420 Extra on: 26/04/16
Easy to apply and results in good even coverage and wood colour by Clive C

Only just applied so cannot comment on long term performance. Appears though to be a well formulated product - and expect good results.

Reviewed 2.5L, Clear - 420 Extra on: 26/04/16
Easy to apply by K Sears

Used on an external hard wood door. Only time and weather will if it does what it claims - but it is easy to apply and feels like a good barrier to protect the wood. Two coats seems to be ample.

Reviewed 2.5L, Clear - 420 Extra on: 25/04/16
Not bad by RM

Iam a little disapointed with this product. I purshased this product last year on my bench but this year I can see black stains coming through the oak.

Reviewed 2.5L, Oak - 425 Extra on: 21/04/16
A note from us...


Thank you for taking the time to send us some feedback. Whilst Osmo 420 is one of the best products we sell, it's fair to say that maintenance (as and when signs of blackening etc occurs) will be required. This in turn causes the growth of mould which is the black stains and patches that you are getting on the surface of your wood. The best way to get rid of these is to treat with a Mould and Mildew cleaner such as Barrettine Mould and Mildew Cleaner.

But I would also recommend application of a good preservative before application of the oil as this will prevent Mould mildew and rot from developing. So just to clarify, 1 coat of preservative and 2 coats of Oil for the best level of protection.

If you have any further question please don't hesitate to get in touch.

Kind Regards Sam.

Very easy to use by Tony Harrison

I used this to protect cedar shingles and found brushing it tedious ( not a fault of the product but more the shingles). Experimented by spraying it and it worked brilliantly well.

Reviewed 2.5L, Clear - 420 Extra on: 20/04/16
Gives very good protection to cedar cladding on new extension by Bill Denholm

Very good protection and easy to apply

Reviewed 2.5L, Clear - 420 Extra on: 18/04/16
Brilliant! This was the reason for the order by J Hoare

This is really great stuff: I have put it on by brush in two coats and it seems to work really well. I could do with more info on how to apply it [can it be sprayed?] and how to know when to apply it - how frequently and so on.

Reviewed 2.5L, Clear - 420 Extra on: 16/04/16
A note from us...


Thank you for the feedback, its always good to hear that customers are happy with the products and the finish that it has achieved. For application we recommend a paint brush or roller, thin application is vital and the ability to work the oil into the wood.

For recoating and maintenance , this will depend on the amount of exposure to the sun and weather that the wood incurs. For South facing areas you may need to refresh more regularly or if we have a bad winter for example, these are all factors that will cause the treatment to wear away and need a maintenance coat. If you have any questions please feel free to email us at wood@finishes.direct.

kind regards Sam.

Ordered 4 50pm, Delivered correctly10 30am next day WOW by D Patterson

Expensive but it is the business.

Reviewed 2.5L, Clear - 420 Extra on: 10/04/16
Easy to use but needs thin coats as recmmended by Alan Thomas

Seems to give protective coating but time will tell. Used it on oak sign boards.

Reviewed 125ml, Clear - 420 Extra on: 07/04/16
'Does what it say' by Ian Collins

I really like Osmo oil. I applied it to an external oak door, which had got a bit tired. I have used other wood treatments before but Osmo Oil seems to penetrate the wood to to give a lasting finish, whilst retaining the original appearance of the oak.

Reviewed 125ml, Clear - 420 Extra on: 07/04/16
Really good, impressive by Derek

Used three years ago (two coats) on sweet chestnut cladding and the appearance is still almost identical to the recently fixed sweet chestnut cladding.

Reviewed 2.5L, Clear - 420 Extra on: 06/04/16
Helped transform a weather-beaten ironwood table by David Jackman

Used Danish Oil to bring out the original wood grain, followed by UV Protection Oil to give it the final protective coat which will hopefully help it survive the wild outdoor weather we can get here in Wales.

Reviewed 750ml, Clear - 420 Extra on: 06/04/16
Rich by Val Ford

Just what I as looking for , a quality nourishing product

Reviewed 2.5L, Clear - 420 Extra on: 25/03/16
Applied easily, well priced and gave a nice finish by Robin Partridge

Applies easily, well priced and gives a nice finish.

Reviewed 750ml, Oak - 425 Extra on: 24/03/16
Easy to apply - no problems experienced by Kenneth Bishop

An excellent product, with comprehensive instructions on the tin

Reviewed 750ml, Clear - 420 Extra on: 18/03/16
Easy to use and long lasting by Ian Raymond

Another brilliant product from Osmo. I produce wooden signage and need something that will keep looking good for a good number of years. Easy to apply by brush but important to remember to apply thinly. Two coats is usually sufficient and depending on conditions, you may have to be patient in allowing it to dry. Anything up to a few days!

Reviewed 750ml, Clear - 420 Extra on: 18/03/16
Great by William Andrew

Easy to apply, brings out the best in wood.

Reviewed 2.5L, Clear - 420 Extra on: 15/03/16
I was surprised how easy it was to apply this product ! by G Thomas

The product was very easy to apply and the lady at Wood Finishes was very helpful as I wasn't sure which product to use. She also recommended the microfibre cloth which made the application very easy. I have put two coats of this on my new oak door and it looks great. So pleased that I want for the natural finish. Only need to do this once a year!

Reviewed 750ml, Clear - 420 Extra on: 04/03/16
Easy to apply , nice finish, by Andrew Binns

Bought this product to finish a pair of Oak gates. I usually treat gates before they leave the workshop. Not possible to do this as the drying time indoors is very slow. Once outside you are at the mercy of the weather. Apart from this disadvantage quite satisfied as finish is excellent.

Reviewed 2.5L, Oak - 425 Extra on: 17/02/16
Applied well though a little thick I think by Ella Sanders

Took a while to dry due to inclement weather, now it is dry it looks amazing on our oak porch. Trust that it will do as it says and protect from the UV rays of the sun and prevent the greying that can happen to oak,

Reviewed 2.5L, Clear - 420 Extra on: 06/02/16

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