Osmo UV Protection Oil Extra

  4.8/5.0   746 reviews

You'll need enter area above for 2 coats (Recommended)

Wood type and application 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
  • Dries to a satin finish
  • 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 & smooth 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 UV 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 preserver 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 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.

746 customer reviews
Did exactly what it said on the tin! by Andrew Meadows

Good quality product and ideal for the cedar wood hot tub.

Reviewed 750ml, Clear - 420 Extra on: 11/09/17
Good product by Geoffrey White

Good quality, nice colour, coverage as expected.

Reviewed 2.5L, Oak - 425 Extra on: 09/09/17
Fantastic for oak by R Backhouse

This only needed two coats and left a lustrous (but not gloss) finish - bringing out the character of the oak well. I believe it will also be easy to revive after weathering.

Reviewed 750ml, Clear - 420 Extra on: 09/09/17
The best exterior coating i've used by Chris Heath

Easy to use , gives a great finish and lasts a number of years. Used it on the oak porch for the second time after previous coat went on 6 years ago , easy to use and apply .

Reviewed 750ml, Clear - 420 Extra on: 08/09/17

Lovely finish to gate, very

Reviewed 2.5L, Clear - 420 Extra on: 07/09/17
Product certainly does what it says on the tin by DR R A GEE


Reviewed 2.5L, Clear - 420 Extra on: 05/09/17
Easy to apply and leaves a beautiful finish by Tracy

Brought to preserve and protect oak boards outside, left a really good finish

Reviewed 750ml, Clear - 420 Extra on: 05/09/17
Easy to apply and appeared to do the job required by Shirley Mitchell

Packed well, easy to apply and did what it was supposed to do.

Reviewed 125ml, Natural - 429 Extra on: 05/09/17
Great product by John Johnson

Just finished all external larch cladding on house with this product having used other osmo before on decking (none slip)

Reviewed 2.5L, Clear - 420 Extra on: 04/09/17

It did everything it said on the tin

Reviewed 125ml, Clear - 420 Extra on: 04/09/17

It did everything it said on the tin

Reviewed 125ml, Oak - 425 Extra on: 04/09/17

Good product and easy to use.

Reviewed 750ml, Oak - 425 Extra on: 25/08/17

Excellent product

Reviewed 750ml, Oak - 425 Extra on: 25/08/17

Good quality product with great results.

Reviewed 750ml, Oak - 425 Extra on: 24/08/17
Covered area and refreshed by Susan Glanville


Reviewed 2.5L, Clear - 420 Extra on: 22/08/17
Great by Rhona Watt

At first I wasn't sure but having tried it for longer I am pleased.

Reviewed 2.5L, Natural - 429 Extra on: 21/08/17
Very easy application by Prof John Webster

Easy application. Two coats needed for previously treated, sanded and cleaned timber. Looks good on pine cladding. Time will tell how it lasts in Scottish conditions.

Reviewed 2.5L, Clear - 420 Extra on: 21/08/17
Great product by Khalid

Easy to apply, good coverage, enhanced the colour of my bench in western red cedar. Fantastic service from Wood Finishes in terms of knowledge, friendliness, price and speed of delivery - would definitely recommend for anything wood.

Reviewed 2.5L, Cedar - 428 Extra on: 21/08/17
Application instructions not that clear - BUT- it works surprisingly well by Colin P

Have been trying for some time to find a product that would preserve the"golden" look on teak handrails on a yacht . After cleaning the teak etc and trying to interpret the instructions on the tin I applied it with a brush very very thinly and it soaks in and goes off after about 8 hours but I don't think I would want to grab the rails for 24 hours. The result has been admired by quite a few people . I've about 1/2 a tin left so will try it on the rubbing strake . This is the CLEAR Product , the 9262 Teak proved much to dark when tried on a small patch . Try a small amount to check the results first is my advice . I thought of mixing the two but advised not to .

Reviewed 125ml, Clear - 420 Extra on: 20/08/17

Looked good, gave the surface a slight shine but otherwise invisible.

Reviewed 5ml Sample, Clear - 420 Extra on: 19/08/17