Osmo UV Protection Oil Extra

  4.8/5.0 (544 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.

  • A professional grade, oil-based UV resistant wood finish for exterior wood
  • Suitable for all vertical exterior wood surfaces including doors, windows, window shutters
  • Contains UV filters to protect wood against greying and silvering over time
  • Offers superb durability against weathering
  • Reduces swelling and shrinkage of the timber
  • Contains biocides to protect against mould, algae and fungal attack
  • Does not crack, flake, peel or blister
  • Easily maintained and renovated
  • Formulated from a blend of natural vegetable oils and waxes
  • Low V.O.C
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, 427S, 426S, 425S, 424S, 428A, 420A, 427A, 426A, 429A, 425A, 424A, 428C, 420C, 427C, 426C, 429C, 425C, 424C, 428D, 420D, 427D, 426D, 429D, 425D, 424D
GTIN 4006850770113, 4006850757152, 4006850911516, 4006850911455, 4006850770106, 4006850911394, 4006850746651, 4006850477791, 4006850911523, 4006850911462, 4006850772056, 4006850684779, 4006850911400, 4006850746668, 4006850477807, 4006850911530, 4006850911479, 4006850772063, 4006850684786, 4006850911417, 4006850746675, 4006850477814, 4006850911547, 4006850911486, 4006850772070, 4006850684793, 4006850911424

Osmo UV Protection Oil Extra is ideal for use on all exterior timber including external doors, window frames, windowsills, carports, timber cladding, balcony, screens & fences, pergolas, summer 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.

Please Note: Osmo UV Protection Oil Extra (Natural 429) has been specifically designed to retain the natural, untreated appearance of lighter timbers such as Oak, Pine and Larch. It is not suitable for dark exotic hardwoods as it may leave a 'milky' or 'white film' appearance to the wood.

The clear version of this product (Clear 420 Extra) can be used as a top coat for Osmo exterior coloured finishes such as Osmo One Coat Only HS Plus, Osmo Natural Oil Woodstain and Osmo Country Colour.

Ensure that wood surfaces to be treated with Osmo Protection Oil are clean, dry and frost-free (moisture content max. 20%).

New Wood

  1. Surfaces should be sanded with a 120 grit abrasive and no finer
  2. New wood and especially hardwoods should be allowed to weather for approximately 6 weeks prior to oiling
  3. De-grease surfaces with methylated spirit or Osmo Brush Cleaner and Thinner (8000) before oiling
  4. Treat the wood with an exterior wood preservative for additional protection if desired

Please Note: Allowing the wood to weather, especially dense exotic hardwoods, enables the tight, dense grain of the timber to open up. This makes it easier to apply the oil and allows it to penetrate deeper in to the wood grain.

Old Wood

  1. Clean old microporous finishes (wood oils) thoroughly
  2. Areas affected by mould, algae and moss must be cleaned and treated
  3. Surfaces should be lightly sanded with a 120 grit abrasive and no finer
  4. Old paints, lacquers and varnish like stains must be completely removed
  5. The colour of timber that has turned grey / silver over time can be restored prior to oiling with Osmo Wood Reviver Gel (6609)
  6. Treat the wood with an exterior wood preservative for additional protection if desired

Always do a test area before starting any project to check suitability and compatibility. Follow the manufacturer's instructions on the tin at all times.

  1. Stir thoroughly before and periodically during application
  2. Where possible treat all sides of the timber prior to installation
  3. Apply protection oil thinly along the wood grain with a natural bristle brush
  4. Work the oil into the surface of the wood grain
  5. Wipe of any excess with a clean, lint free cloth
  6. Allow to fully dry
  7. Apply a second coat as above


When renovation is required, ensure that surfaces are clean and dry.

  1. Lightly sand or use a stiff brush to remove surface dirt and debris
  2. Apply a thin maintenance coat of Osmo Protection Oil, taking care to work the oil in to the surface of the wood and wiping off any excess
  3. For wood that has become discoloured or is showing signs of mould, algae or moss, refer to the preparation and application sections above

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. This said however, we have customers that have used Osmo UV Protection Oil with success on these woods.

Wiping the timber down with methylated spirit prior to applying the oil can aid penetration with these wood types. Other things that can help include allowing the wood to weather for 6 weeks and ensuring that the oil is at a good room temperature which keeps it thinner. Cold temperatures thicken the oil making application more difficult.

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

A. Osmo says that this product is not 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.

544 customer reviews
Top quality product by Kevin Bateman

Would not use anything else on my oak flooring or any other wood, easy to apply very hard wearing

Reviewed 2.5L, Natural - 429 Extra on: 25/03/17
This is the best way to keep wood looking new by Andrew Bolton

18 months ago I fitted new gates to the front of my property. I pretreated with 2 coats of Barretine Clear wood preserver , then two coats of Osmo Light Oak Natural Oil Woodstain and finished with 2 coats of clear Osmo UV protection Oil Extra. I just did a maintenance coat of Osmo UV Protection Oil Extra. After 2 very wet winters, the gates are still looking like new. I also used on a field style gate and again, still looking like new after 18 months. I have used many wood treatments over the years and Osmo UV is the best.

Reviewed 2.5L, Clear - 420 Extra on: 25/03/17
Not used it yet! by Woodsavvy
Reviewed 2.5L, Cedar - 428 Extra on: 23/03/17
Took days to dry by Richard Green

Used this as a test sample on some Cedar and it was still tacky after 2 days. Would have been a real mess if we had applied it without testing

Reviewed 5ml Sample, Clear - 420 Extra on: 23/03/17
Great product by James Pettet
Reviewed 750ml, Natural - 429 Extra on: 23/03/17
Excellent product quick delivery by Marie Jeynes
Reviewed 2.5L, Oak - 425 Extra on: 23/03/17
Application was easy, with a very pleasant amber finish, long term UV protection I will review in due course^ by P. R. Beckett
Reviewed 2.5L, Clear - 420 Extra on: 21/03/17
Relatively easy to use takes a little more than 12 hours to dry , end result exalant by Philip Cross

I used this product on oak patio furniture and am very pleased with the results

Reviewed 2.5L, Clear - 420 Extra on: 18/03/17
We love this product by Jacqui W

Easy to use, long lasting, protects wood beautifully, always use it on exterior wood.

Reviewed 2.5L, Clear - 420 Extra on: 18/03/17
Superb product by Benjamin Hartle
Reviewed 2.5L, Clear - 420 Extra on: 09/03/17
Half finished application, waiting to see how it weathers by Alison Clark

I used this on cedar cladding on the exterior of a building. I applied it at about 5 to 6 degrees C and it seemed that it was a bit too cold, and the waxy element of the solution was thickening from the cold. I am going to try again when it warms up to about 10 degrees C. The first coat did go on ok, but maybe a bit too thick, because of the cold. It it repelling water well so far.

Reviewed 2.5L, Clear - 420 Extra on: 06/03/17
Excellent by Michael McManus

Applied the product to IROKO gates and the difference was astounding, superb finish.

Reviewed 750ml, Clear - 420 Extra on: 03/03/17
Excellent product by Katie Pierce Jones

Leave the wood almost its original colour which is what we were looking for. Hopefully the UV protection will prevent the colour from altering. It seems expensive but a little goes a long way. Excellent quality.

Reviewed 2.5L, Natural - 429 Extra on: 02/03/17
Good by Malcolm Wardle

Easy to apply

Reviewed 2.5L, Clear - 420 Extra on: 24/02/17
Easy to use by Richard Green

I used this on a oak framed building where the timber is on show so it needed protection. The old oak was quite weathered and the osmo oil both covered and filled the minor cracks. The new oak covered well and looks lovely. You do get the wet look to the finish and it is important to brush it out well otherwise it takes a long time to dry.

Reviewed 2.5L, Clear - 420 Extra on: 22/02/17
Excellent and very easy to apply by Ben
Reviewed 750ml, Clear - 420 Extra on: 21/02/17
Nice finish by Mr R Kenneth
Reviewed 750ml, Clear - 420 Extra on: 17/02/17
Nice finish by Mr R Kenneth

Will be ordering again next time

Reviewed 2.5L, Clear - 420 Extra on: 17/02/17
Excellent product by Julie Ward
Reviewed 2.5L, Clear - 420 Extra on: 15/02/17
Good product, good price, good service by Julie Ward
Reviewed 2.5L, Clear - 420 Extra on: 14/02/17