Introducing     learn more

Osmo UV Protection Oil Extra

  4.8/5.0 (502 reviews)
On-screen colours may vary according to different screen calibrations. We therefore always recommend applying a test area.
2 coats = Recommended
Total: enter area

Wood type and application method can vary coverage.

Osmo UV Protection Oil Extra is a superior wood oil that acts like a "sun cream for wood". It offers superb durability against weathering with additional biocides.

  • Protects against greying with UV-Protection factor 12
  • Will not crack, peel, flake or blister and provides a microporous, breathable surface
  • Based on natural, renewable resources
  • All-in-one finish that also protects against mould, algae and fungi attack

Please note: 125ml tins are printed in German only.

Brand Osmo
No. of coats 2
Coverage Up to 20 per litre
Drying time 12 hrs
Size 5ml Sample, 125ml, 750ml, 2.5L
MPN 428S, 420S, 425S, 428A, 420A, 429A, 425A, 428C, 420C, 429C, 425C, 428D, 420D, 429D, 425D
GTIN 4006850770113, 4006850757152, 4006850770106, 4006850746651, 4006850477791, 4006850772056, 4006850684779, 4006850746668, 4006850477807, 4006850772063, 4006850684786, 4006850746675, 4006850477814, 4006850772070, 4006850684793

Perfect for use on all exterior timber including external doors, window frames, windowsills, carports, timber cladding, balcony, screens & fences, pergolas, garden houses and furniture. Osmo do not recommend that this product is used on flat horizontal surfaces where water can collect such as floors, decking and wooden steps.

IMPORTANT: The Osmo 429 Extra has been specifically designed to retain the natural, untreated appearance of lighter timbers such as Oak, Pine, Larch, however it is not suitable for dark exotic hardwoods as it may result in a 'milky' finish or appearance.

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.

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.

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.

The Clear Osmo UV Protection Oil Extra 420 Extra can also be used for lightening or overcoating Osmo Natural Oil Wood Stain for added protection and durability.

Over Application of Natural - 429 Extra will result in a 'white wash' finish and in the worst cases white swirls, brush marks and a sticky or tacky surface. A test area and trial application should be undertaken before starting any project.

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 does not recommend that this product is applied to flat horizontal surfaces where water can collect such as floors, decking and wooden steps etc.

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

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.

502 customer reviews
Fantastic finish for my oak frame lounge by Adam Bancroft

This product was recommended by wood finishes direct. It is a brilliant product and I would thoroughly recommend it.

Reviewed 2.5L, Clear - 420 Extra on: 26/11/16
Ver good by Jane Davis

Very good. Easy to apply.

Reviewed 2.5L, Oak - 425 Extra on: 25/11/16
Good quality product by Roger Bellamy

Whilst good to apply and brings out the natural sheen of the wood, it's a bit early to judge the 10-year durability!

Reviewed 2.5L, Natural - 429 Extra on: 22/11/16
Excellent - though I guess time will tell! by Peter Ireland

This is as good to use and gives as good an initial finish as I am used to from Osmo products. Brings out the character of the wood beautifully. It will need several years before I can really tell how its UV protection performs - I just assume Osmo have done their testing.

Reviewed 750ml, Clear - 420 Extra on: 19/11/16
Great product which was easy to apply and enhance the wood by Dave Berry

Really easy to apply and goes a long way. It enhanced the timber cladding, the client was extremely pleased with the end result.

Reviewed 2.5L, Natural - 429 Extra on: 17/11/16
Easy to use by Moira Gedge

Worked well

Reviewed 750ml, Clear - 420 Extra on: 10/11/16
Good for outdoor decking by Francis Reed

This certainly has spruced up the appearance of our outside decking. It remains to be seen how long it will be, before another rating is needed.

Reviewed 750ml, Clear - 420 Extra on: 06/11/16
Does what it says on the tin by Catherine Newton

This is an excellent product would not use anything else after seeing the results.

Reviewed 750ml, Oak - 425 Extra on: 04/11/16
Good colour by Kelly Archer

Went on a bit like marmite in places and had to really work at spreading out the colour in tight areas but beautiful quality.

Reviewed 2.5L, Oak - 425 Extra on: 30/10/16
Best of its kind on market by Raymond Grieve Building Contractor & Merchants

We use this product a lot, it does exactly what it says it does. We also use the one with out UV for internal woodwork.

Reviewed 2.5L, Clear - 420 Extra on: 30/10/16
Excellent Product!! by Dana Haughton

I've just started using it on the cedar wood cladding on my house (I've done a quarter of one side) and I'm so impressed with how it renews the wood to its original glory that I want start on all my fencing!!! Absolutely brilliant.

Reviewed 5ml Sample, Clear - 420 Extra on: 30/10/16
Excellent, this is a first class product and gives a highly professional finish by Matt Jones

This product really helps to enrich the natural colour of the wood, it is easy to apply and comes in a sturdy tin. This is a really good buy and has been the perfect choice for treating my cedar clad house.

Reviewed 750ml, Clear - 420 Extra on: 29/10/16
Excellent, this is a first class product and gives a highly professional finish by Matt Jones

This product really helps to enrich the natural colour of the wood, it is easy to apply and comes in a sturdy tin with robust carrying handle. This is a really good buy and has been the perfect choice for treating my cedar clad house.

Reviewed 2.5L, Clear - 420 Extra on: 29/10/16
The finishing touch by Mike Vyvyan

I am using this product to provide UV protection on two log cabins already coated with Osmo wood stain. I think it will provide a long term and durable finish. I have used a number of Osmo products and they are excellent, worth the high cost.

Reviewed 2.5L, Clear - 420 Extra on: 29/10/16
Great product - goes on well and does what it promises by Peter Docker

Made our oak 'wall' look terrific, bringing out the grain and enhancing the colour. Time will tell how long it lasts, but so far we're delighted. It was also easy to apply (with a brush). Took a while to dry (outside temperature was only around 12 degrees C) and we had a few splashes of unforecast rain but this did not seem to affect the finish.

Reviewed 2.5L, Clear - 420 Extra on: 28/10/16
Excellent by Marie

I used this product to treat an oak door. It is important to apply as thinly as possible and when you do the finish is lovely. Never used anything like it before but will cerainly use again as it gave such a professional even finish.

Reviewed 125ml, Natural - 429 Extra on: 28/10/16
Easy to apply by Jayne Nicola

Really brings out the colour of the wood

Reviewed 2.5L, Clear - 420 Extra on: 27/10/16
Good Quality & Not Too Toxic by Ann Cashman

Osmo products are a bit pricey, but good quality, in my experience. I bought this particular product because I asked Wood Finishes Direct for an eco-friendly one. I followed the instructions, and applied two thin coats. I used less than 750ml for a 6x6-foot shed. The rain runs straight off it now, and I wish I`d bought this product along with the shed, and applied it straight away, instead of taking the advice of the company I got it from and waiting a year. WFD advised me to buy a 2.5L tin, but after thinking about it and reading the reviews on this site, I instead got 3x750ml tins. Unopened, their shelf-life will be 5 years. The shed now looks good, and I don`t get that horrible sinking feeling when I see it.

Reviewed 750ml, Clear - 420 Extra on: 26/10/16
Slow drying by John Downing

Good product but not what I needed for a staircase. Colour was virtually the same as the ceder. Good product but not what I needed. Thank goodness for the sample.

Reviewed 5ml Sample, Oak - 425 Extra on: 24/10/16
Took an age to dry by John Downing

Tried this for my new stairs. Took a longtime to dry and was not the right product for high footfall areas so didn't bother. Colour was excellent very rich though there was no difference between the oak colour.

Reviewed 5ml Sample, Cedar - 428 Extra on: 24/10/16