Osmo UV Protection Oil Extra

  4.8/5.0   693 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 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 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.

693 customer reviews
Excellent product but was bought for a specific job and not required again at the moment by Carole


Reviewed 750ml, Spruce - 424 Extra on: 14/07/17
Excellent product, have used it before to good effect by Reginald Bowers

Looks good when completed and stands the test of time.

Reviewed 750ml, Oak - 425 Extra on: 13/07/17
Excellent by Saikung

The information on the tin was accurate.

Reviewed 2.5L, Natural - 429 Extra on: 12/07/17
Goes on very easily On cedar it looks excellent by Nicholas Lea

Purchased this for some external cedar cladding. Very easy to apply. Looks excellent and natural. Time will tell how well it protects and weather's.

Reviewed 2.5L, Clear - 420 Extra on: 12/07/17

Easy to use, great finish

Reviewed 2.5L, Clear - 420 Extra on: 10/07/17
Excellent by Simon Kluge

Easy to apply and excellent finish

Reviewed 750ml, Clear - 420 Extra on: 09/07/17

Still in work in progress - so far good

Reviewed 2.5L, Clear - 420 Extra on: 06/07/17
Excellent product covers well and brings out the character of the wood by Robert Voce

Easy to apply and goes a long way I used this on our wooden bridge and garden furniture which now looks superb.

Reviewed 2.5L, Clear - 420 Extra on: 03/07/17
Easy to apply, so far it does not flake by N Scott

I have been trying to find a solution to the painting of my external, southern facing, wood windows and patio doors, which are a mixture of soft and hard woods. Most products seem to be similar to varnish and flake after a couple of years. So far this Osmo oil seems to be applied in a very similar fashion to earlier products but after one year no flaking is evident. My current aim will be to apply three coats to start with (to bare wood), then clean and apply a single fresh coat annually. This hopefully will be a great saving compared to full sanding and then applying three coats of the earlier products every two years.

Reviewed 750ml, Clear - 420 Extra on: 29/06/17

Exellent service and looks a very good product. Many thanks

Reviewed 750ml, Clear - 420 Extra on: 29/06/17
A top end product by Deborah Stanfield

Easy to use with a fantastic finish; far superior to more main stream brands. Well worth the money.

Reviewed 750ml, Clear - 420 Extra on: 28/06/17
This is the best I have used and i have used a lot ?? - Great product by Graham Rice

This UV Oil is great, I highly recommended this product, give it a try you will not be disappointed, i now use Osmo for all my wood projects. can't beat it

Reviewed 125ml, Natural - 429 Extra on: 27/06/17
Pleased with product and service by ROB HOLLEY

Have used this on new cedar roof for summerhouse. Easy to apply and after three weeks it's looking good. Plan to recoat before winter.

Reviewed 750ml, Clear - 420 Extra on: 26/06/17
Once dried looks fantastic by David Watson

Although expensive, compared to most, this is after all an oil-based product. The finished appearrance was darker than the web image but then again that could be down to me being a bit 'heavy handed' in the application. I used 3 x 2.5 Litre and one 750 ml tins to cover a six foot high and sixty six foot long rough sawn timber garden fence. The posts and weather board were concrete. The finished fence looks absolutley fantastic and when it rained the water just formed as droplets which shows that the effects of the penetrating oil are working. Would I buy and use this product again? Definately yes - despite the initial cost the long term benefits far outweigh it.

Reviewed 2.5L, Oak - 425 Extra on: 25/06/17
Used on shed by Annette Yates

2 coats applied as directed on the tin. Brought out the grain in the wood, shed looks lovely. Very pleased with the product and would recommend.

Reviewed 2.5L, Clear - 420 Extra on: 23/06/17
Another top quality product from Osmo by Wendy Ewart

Beautiful product and clear ,so can see original colour of the wood. Great finish.Well worth the price.

Reviewed 2.5L, Clear - 420 Extra on: 22/06/17
Absolutely brilliant very easy to apply and after the 2nd coat, wow! my Iroko gates look stunning by Hough

A Fantastic , quality product, at the high end of pricing but you certainly get what you pay for

Reviewed 2.5L, Clear - 420 Extra on: 21/06/17
Lovely finish by M Knight-Dixon

Very rich natural finish

Reviewed 750ml, Clear - 420 Extra on: 21/06/17

Used to redcoats work done 4 years ago good colour retention and easy to apppy

Reviewed 2.5L, Cedar - 428 Extra on: 19/06/17
Very good quality oil by Alexander Buchan & Son

This is the only oil that i found in my seach that could do the job

Reviewed 2.5L, Natural - 429 Extra on: 18/06/17
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