Osmo UV Protection Oil Extra

  4.8/5.0 (591 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.

591 customer reviews
Puddly little sachet of product , ludicrously expensive by John Richards
Reviewed 5ml Sample, Cedar - 428 Extra on: 25/05/17
A note from us...

Hello Mr Richards,

The 5ml sample are £1.02 each and this allows you to carry out a test area before purchasing a large tin. Opening the larger tin to carry out a test area would then mean you could not return the tin under our returns policy guidelines. We often recommend the sample sachets first to avoid any disappointment with colours. And these sachets are particularly helpful for people who are ordering a number of samples to try.

We do also have the larger sample size of 125ml tins which for some people are a more suitable size. For more information please feel free to get in touch via our contact page.

All the Best Samantha.

What a brilliant product it has transformed my entrance gates easy to use by Mr L G Vesey

Brilliant Dose what it states on the tin.

Reviewed 750ml, Oak - 425 Extra on: 22/05/17
Time will tell by ROB

Very pleased with this product. Easy to apply with good coverage. The UVA protection obviously needs time to evaluate. ( Have used this on a cedar slatted summerhouse roof).

Reviewed 750ml, Clear - 420 Extra on: 22/05/17
Good coverage and easily applied by Graham Whettall

Does exactly what's claimed of it. An excellent preservative for natural timber.

Reviewed 750ml, Clear - 420 Extra on: 20/05/17
Great product, good coverage and really brings out natural beauty of the wood by Nick Long
Reviewed 2.5L, Clear - 420 Extra on: 20/05/17
Easy to Apply, nice finish by Martin Hardy

After applying each coat I wiped off the excess and I have a really nice finish

Reviewed 2.5L, Clear - 420 Extra on: 17/05/17
Does what it says on the tin by Ann Atkinson
Reviewed 2.5L, Clear - 420 Extra on: 17/05/17
Great service, fast delivery by G W D

Good quality product, easy to apply with excellent coverage

Reviewed 125ml, Clear - 420 Extra on: 15/05/17
Worth the money by Andy Peart

This is the third large tin of Osmo clear oil that I've purchased and it works brilliantly. I used two coats of the oil on cedar cladding (as part of a major extension), putting it on before the cladding was fastened to the outside of our house. Take care not to allow any runs as once dry day show on the cladding. Two years on I just added a further coat. The coil brought out the grain of the cedar which I really like and has definitely prevented it from weathering - it looks as good now as the day was put up. I've also used Osmo oil on internal oak doors and appoint table both with excellent results. I've even used The Cedar coloured version on a rough cut Fence and it's worked remarkably well - expensive but well worth the money

Reviewed 2.5L, Clear - 420 Extra on: 14/05/17
Does what it says on the tin by Kam Sachdev

easy to apply and the online videos on how best to apply and look after your wood is very helpful.

Reviewed 750ml, Clear - 420 Extra on: 09/05/17
Good product delivered promptly, gives the cedar shingles an attractive colour by John Wills
Reviewed 2.5L, Cedar - 428 Extra on: 09/05/17
Top quality by Alan Whitehead

Natural colour. Gives good, even coverage. Two coats seems ample so means it goes further than some cheaper products.

Reviewed 750ml, Oak - 425 Extra on: 09/05/17
Have been using Osmo products for 11 years Nobody makes anything better to protect your expensive timber and keeping it looking like new, by Paul Cusack

Does exactly what it says on the tin, if you follow their instructions to the letter, it will keep your timber looking like new.

Reviewed 750ml, Clear - 420 Extra on: 09/05/17
Nice finish by James Lythe

Nice raw look finish that's easy to apply

Reviewed 2.5L, Natural - 429 Extra on: 07/05/17
Expensive but good by Mr P Roberts

Brushes on well and good coverage. Several thin coats seems to be the best method

Reviewed 2.5L, Oak - 425 Extra on: 07/05/17
V good by Mrs Cooke

Easy to apply, thin application required. A little goes a long, long way. My oak door looks new and pale in colour again. Make sure to prep wood properly before application.

Reviewed 750ml, Natural - 429 Extra on: 04/05/17
Delighted with this product by BRIAN GOOD

Simple and quick to apply, brings up tired looking wood beautifully and seals from the elements

Reviewed 750ml, Clear - 420 Extra on: 03/05/17
The only clear on the market that keeps the natural look of cedar which keeps my cladding looking beautiful and full of character by Mr C Donald

This product is a clear, not like most with a colour through it, it has kept my cedar cladding looking absolutely awesome, i will order some every year and keep my cedar protected and looking the way it does from new, very happy with this product.

Reviewed 5ml Sample, Clear - 420 Extra on: 03/05/17
Fantastic finish by Child's Play Nursery

Easy to use. Not a cheap purchase, but surprisingly good coverage. Fabulous finish

Reviewed 750ml, Natural - 429 Extra on: 03/05/17
Spiffing by Brian Carter


Reviewed 2.5L, Oak - 425 Extra on: 03/05/17