Osmo UV Protection Oil Extra

  4.8/5.0   777 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, 4006850834563, 4006850834150, 4006850935154, 4006850935130, 4006850860807, 4006850834402, 4006850935116, 4006850834617, 4006850827756, 4006850935161, 4006850935147, 4006850860791, 4006850834464, 4006850935123

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.

Before opening the 5ml sample sachets, squeeze the packet several times to ensure that the oil and pigments inside are thoroughly mixed.

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.

777 customer reviews
Early days yet, however the oil seemed to be weather resistant within hours of being applied by Philip Lewis

Easy to apply and effective - so far

Reviewed 2.5L, Clear - 420 Extra on: 20/11/17
Does the job well by Russell Matthews

Used it before, bit expensive but is a quality product, used it on my summerhouse

Reviewed 750ml, Cedar - 428 Extra on: 18/11/17
Brilliant colour for older Larch by Monzar Najami

Five years ago I have put up a new first floor on our bungalow made from timber frame and exterior Larch cladding. I have used OSMO 420 initially for preservation and longivity. I have refresshed it two years ago. However, as ever, the sides of the Larch started to show a bit of silvering, so I used a mixture of red cedar 428 and clear 420 ( 50/50) to restore the Larch, and it now looks super. Used also the OSMO wood reviver Gel at difficult locations, that was tiring to use and had to apply twice, sometimes no great success- but with t hered cedar tint it did the trick. Will have a major repaint job this summer and will buy this product

Reviewed 750ml, Cedar - 428 Extra on: 11/11/17
First class product by MR P J WALKER

Before my first purchase of this product from this company about three years ago I had used alternative treatment and suppliers which gave very inferior results. Having done some research I came across this treatment from Wood Finishes Direct. It has proven very good indeed, the best treatment for horizontal oak beams exposed to all elements. Although quite expensive it is worth the extra for the result is superb.

Reviewed 125ml, Oak - 425 Extra on: 10/11/17
Really good by Chris

Use on top of Country colour to help with mould control on our coastal property. Helps a lot.

Reviewed 2.5L, Clear - 420 Extra on: 10/11/17
Great Have protected my larchlap extension to my house also 3 large outbuildings- Now looking at the stables! by Martin Smithson

Have used Osmo in the past, delighted with it then, as I am now with the latest batch. The finish and protection is almost beyond belief. An amzingly good product - gives lasting protection and looks. Well worth the expense.

Reviewed 2.5L, Clear - 420 Extra on: 09/11/17
Pleasant finish by Ken Duffy

takes a while to dry but good finish

Reviewed 750ml, Clear - 420 Extra on: 07/11/17
Excellent product, ecellent delivery service, excellent result by Mary Stanton

Used on shingles long overdue for treatment. Excellent result. The house is greatly admired by all who pass - thanks to Osmo and our conscientious tradesman. Will certainly use it again in the future.

Reviewed 2.5L, Cedar - 428 Extra on: 05/11/17
Seems to work well not had it on long enough to know by Reginald. Thirlwall

Goes on well but like it says on the tin better to be dry or warm.

Reviewed 2.5L, Natural - 429 Extra on: 05/11/17
Easy to apply looks good by Brian

Used as a follow on to Osmo wood reviver, which left the wood quite pale. But this made it look like oak again.

Reviewed 750ml, Oak - 425 Extra on: 03/11/17
Excellent oil and just what i needed for my external garage doors by Gary Knipe

This product does exactly what it says on the tin

Reviewed 2.5L, Cedar - 428 Extra on: 02/11/17
Excellent by Mrs Fiona Barber

Professional and well informed customer service led to our purchasing the ideal product to revive our oak porch. - delighted with the outcome and would definitely recommend Wood Finishes Direct and their Senior Sales Advisor Alison Oakes.

Reviewed 750ml, Oak - 425 Extra on: 01/11/17
Summer house looks like new again by Edith Townsend

Does a great job reviving our pavilion. Am very pleased with the result.

Reviewed 2.5L, Natural - 429 Extra on: 01/11/17
Since discovering Osamo UV protection oil, I would never use any other product by Michelle Winter

The longevity of the effects of the oil on outside wood is outstanding and even after 3 years of weathering, the wood looks it was put on yesterday

Reviewed 750ml, Natural - 429 Extra on: 30/10/17
So far, very good by Alex Wills

Wood finishes were extremely helpful and informative. The product seems very good although I have only prepared samples so far. I had to pay for the sample which I think should be free with orders of other Osmo products over a certain amount or at least redeemable of a later purchase of the colour you want.

Reviewed 5ml Sample, Cedar - 428 Extra on: 30/10/17
A few external doors and gate by Hal Bagot

Easy to apply, stops oak going grey.

Reviewed 125ml, Clear - 420 Extra on: 27/10/17
Excellent adhesion and coverage and great finish by MR N COCKBURN

excellent product when applied to prepared surfaces

Reviewed 2.5L, Oak - 425 Extra on: 25/10/17
Dependable expensive product but you get what you pay for by Mr P C Brereton

No need.... just does as it says on the can!

Reviewed 750ml, Clear - 420 Extra on: 23/10/17
Good product with prompt delivery by Graham

I had used Osmo clear in the past on an exterior oak frame which was good. The 425 Oak does not appear to have that much colour in it, but it did raise the tone the finished article and it looks a little smarter than with the clear.

Reviewed 2.5L, Oak - 425 Extra on: 23/10/17
Seems a wonder product by Harpy

Reviewed 750ml, Natural - 429 Extra on: 23/10/17