Osmo UV Protection Oil Extra

  4.8/5.0 (396 reviews)
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2 coats = Recommended
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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, 429A
GTIN 4006850770113, 4006850757152, 4006850770106, 4006850772056

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.

396 customer reviews
Very Good by David Leeming

So far so good. This particular colour is a very deep redish brown which was what I was after. The most important thing is whether it will survive outside for years to come. It replaces Cetol Novatec which despite all its claims flakes after a few years so fingers crossed with Osmo

Reviewed 2.5L, Cedar - 428 Extra on: 17/08/16
Gives the wood a lovely natural finish by Andrew Prophet

Time will tell on the UV protection but looks good

Reviewed 750ml, Clear - 420 Extra on: 16/08/16
Good product by Peter Aucott

Have used before, works well but can thickened with age in the tin and I am not sure how to get back to original consistency, would heat work?

Reviewed 750ml, Clear - 420 Extra on: 16/08/16
A note from us...

Hello Peter,

Allowing the tin to stand for 24/48 hours at room temperature or a warm room should help the oil to get back to its normal consistancy. I wouldn't recommned heating as such but certianly standing next to a warm radiator or in the sun for a short while could also help.

All the Best Sam.

Osmo oil clear uv protecting by Dr N Farmer

We used the uv clear protecting osmo oil to treat a larch timber framework for a conservatory. This product, while not adding colour to the timber brought out the natural hue of the wood and hopefully will prevent it from turning silver. It is easy to apply, but the knack is to work it into the wood and not over apply the product, we first treated the wood with clear barratine preservative.

Reviewed 2.5L, Clear - 420 Extra on: 16/08/16
Easy to apply, does the job perffectly by David Fielding

If you have oak that needs a weatherproof finish while retaining the natural golden glow of the wood, this is the product to apply after sanding down

Reviewed 750ml, Clear - 420 Extra on: 13/08/16
Like maple syrup to paint on Easy to apply by Joy Elphinstone

Gave lovely sheen to the wood. Darkened colour but said it would. Made the wood look better treated, less dry and well protected.

Reviewed 2.5L, Clear - 420 Extra on: 12/08/16
Best product for wood by Sharon J

Wouldn't use anything other than Osmo inside or out!

Reviewed 2.5L, Clear - 420 Extra on: 12/08/16
Easy to apply, leave your brush in water until the 2nd coat gives a really good finish use a good paint brush I used a roller and it all bubbled up fortunately I was able to brush out the bubbles Takes a long time to dry not too smelly but the finish is by Keith Greenhall
Reviewed 750ml, Clear - 420 Extra on: 12/08/16
Easy to use gave a good finish by Mrs Denton

Osmo UV Protection Oil Extra well worth the money, easy to use gave good finish very satisfied.

Reviewed 2.5L, Clear - 420 Extra on: 11/08/16
Excellent product by Mr Paul Hancock

Good quality product and easy to use! Far better than other products I've used

Reviewed 2.5L, Clear - 420 Extra on: 11/08/16
Well recommended by colleague by Louise Lewis

Great. Easy to use. Goes a long way. Quality finish.

Reviewed 750ml, Oak - 425 Extra on: 10/08/16
Brilliant product by Elizabeth Marlow

As expected, the oil is a quality product. Very easy to apply and the coverage and finish is excellent.

Reviewed 2.5L, Cedar - 428 Extra on: 09/08/16
Very small sample by Michael C, Lincs

Very small Size of sample makes it difficult to test finish when different woods involved in a project. However, all in all the oiled finish was what I hoped it would be and I have since ordered 5 litres. It seems to be an excellent product, the loss of one star in the rating purely down to the limited amount in this sample.

Reviewed 5ml Sample, Clear - 420 Extra on: 07/08/16
Easy to apply by Richard

Easy to apply on test piece, but on the exterior plywood we were applying this to, the result was too orange for our requirements so in the end we did not use it. So nothing wrong with the product, just we did not need to use an oil based solution.

Reviewed 750ml, Clear - 420 Extra on: 07/08/16
Perfect finish at a great price by Peter Sheridan

I purchased this product to protect and enhance a new teak bench. Very impressive finish. Would recommend it for any similar job

Reviewed 750ml, Clear - 420 Extra on: 07/08/16
Fantastic product Very easy to use and my wife is happy also!! by William Lawrence

I have used this product for two purposes. The first was the Bowsprit my Gaffer. It had suffered a bit and there were a few minor shallow cracks. The Osmo UV protection gave a great finish with a few thin coats. I used the cedar variety. All cracks filled and looks good. In particular the hot sun of Var has caused no problems. I would use again. As I found this so good and had plenty to spare I have used also for Skirting boards. No masking tape needed just a pointed brush No (15) and very easy to get a good line. I am very pleased with the product.

Reviewed 750ml, Cedar - 428 Extra on: 03/08/16
Easy to use covers well and gives a very good finish by Charles Duncan

Very impressed with the OSMO satin finish product. I trust that it will perform long term as per the its claims. Look forward to lasting protection to our furniture.

Reviewed 750ml, Clear - 420 Extra on: 02/08/16
Faust what we wanted by John Swain Ltd

Sadly we ordered more than we really needed, so will order less next time.

Reviewed 2.5L, Clear - 420 Extra on: 31/07/16
Better than expected by Paul Gott

The product is far better than I thought, my Porch looks like a brand new one.

Reviewed 2.5L, Oak - 425 Extra on: 29/07/16
Easy to use by Albert

Best built up in light coats. Ideal for bringing out the beauty of Douglas Fir grain

Reviewed 750ml, Clear - 420 Extra on: 27/07/16

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