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Osmo UV Protection Oil Extra

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Osmo UV Protection Oil is a superior exterior oil that blocks the greying effect of the Sun's UV rays by a factor of 12. It offers superb durability alongside biocide protection against insects and fungal growth.

Easily applied with a paint brush or mohair roller Osmo UV Protection oil dries a satin-matt finish that will not peel or flake.

Can also be used for lightening or overcoating the Osmo Natural Oil Wood Stain colour range.

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  • Overview

The Osmo UV Protection Oil has been designed in order to combat the greying effects of the Sun's UV rays. Many woods like oak, teak and iroko to name just a few will become grey or silver over time and this oil will slow down that greying process by a factor of 12 when compared to natural wood. Normally the Sun's rays can penetrate through the clear coatings and bleach the wood below but this product contains special ingredients to combat this. The '420 Extra' contains Biocide which is a combination of insecticide and fungicide making it ideal for outside use.

This product is micro-porous, thus allowing the wood to breathe. Because the oil does not form a seal on the surface of the wood it cannot peel, flake, crack or blister. It is based on natural oils and offers a very clear, natural effect when compared to other 'clear' oils and penetrates into the wood grain aiding the natural elasticity of the wood and helping to reduce shrinkage and swelling.


Ensure surfaces are clean, dry and are free from any surface coating such as paint or varnish before application.

New unpreserved or old wood can first be treated with a quality wood preservative such as Barrettine Wood Preservative or Ronseal Total Wood Preservative before applying Osmo UV Protection Oil. Using a wood preserver prior to applying the oil offers the best all round protection. Allow sufficient time for the preservative to dry before applying the oil.

Osmo WR Base Coat 4005 penetrates deeply into the wood to repel water and reduce the risk of swelling and shrinking but does not contain an insecticide.


Apply in THIN coats with paint brush or mohair roller. Always finish your brush or roller strokes by going in the direction of the wood grain. Osmo UV Protection Oil Extra 420 can also be applied over Osmo Natural Oil Woodstain as a top coat for added protection and durability.


Slightly tired looking areas can be easily refreshed by simply cleaning the affected areas and applying more of the oil. Even badly scratched areas can be seamlessly repaired with a light sanding and a re-application of the oil.


Osmo recommend that this product is NOT used on horizontal surfaces such as floors, decking and wooden steps etc.

On the tin it states that it is not suitable for use on Iroko and Teak timbers but customers have used it with success on these woods. Our advice is to ensure the oil is well pushed into the wood grain as it they are tighter and less porous woods. Sanding them a bit rougher (about 150 grit sandpaper also help).


Q. We have a garden table which says only use Roble Wax and not linsead oil. I have searched for this product and even with the Internet have not succeeded. The table was from B+Q. Please can you help me?

A. To my knowledge, it's only B&Q that offer the Roble garden furniture in The UK and the product recommended for finishing it is indeed hard to find. We have looked into this thoroughly and can confirm that Osmo's UV Protection Oil is ideal for Roble wood. As Roble is a dense, oily wood it is important to work the oil into the wood well and apply it thinly.

  • Reviews

Osmo UV Protection Oil Extra reviews - Rating: 4.8 out of 5 stars, based on 148 reviews.

Filter:   All reviews (148)   5 stars (120)   4 stars (24)   3 stars (2)   1 star (2)  

John Emery

 2.5L, Oak - 425 Extra
Easy and professional finish
I used this oil for my redwood fence panels. It was very easy to apply (thin thin coats) and looks fantastic. It has rained since and it's great to see water beading away! Very highly recommended - should only need a one coat top up every few years. I would suggest buying the brush cleaner from Osmo - I didn't and regretted it. I couldn't get the oil out of the brush so I left it overnight in water until I was ready to apply the second coat! It worked.... Will definitely buy again and from woodfinishesdirect.com as the service and cost were exceptional.
Andrew C

 750ml, Clear - 420 Extra
Do not use on mahogany. Leaves an awful surface finish.
Despite the claims that this product can be used on weathered mahogany ....... don't do it! I used this on my front door (exterior side) which was installed 25 years ago. My preparation was immaculate, with all trace of previous coatings removed. I was right back down to bare timber using 120 grit sandpaper as recommended on the tin. All dust was removed (vacuum cleaner followed by meths). It looked lovely. All it now needed was a nice sheen by applying an appropriate oil finish. Enter Osmo UV Protection Oil (420 clear). I did not over-apply this product, applying with a lint free cloth. Just wiped it on, and then immediately took off any excess oil to leave a nice sheen. So far, so good. The wood had taken on a lovely colour. But 24 hours later the surface, whilst looking lovely, had the feel of a waxy candle. 48 hours later, just the same. So what to do? I have started cutting it back with white spirit. Gone over it once and that has slightly improved it. Will need doing again, and suspect that I will be doing this once every couple of weeks until I've got all of this horrible stuff out of the wood. You have been warned ..... this is a nasty product.
Evelyn Jefferies

 2.5L, Clear - 420 Extra
Easy to apply, leaves a nice finish
Easy to apply and went a long way. A decorator friend says it's 'the best' and I can't disagree. The rain was just bubbles on top of the wood, even though we'd only oiled the summerhouse the day before.
Mr Humber

 2.5L, Clear - 420 Extra
Awesome product definitely recommended
Great product, easy to apply and you can see the wood return to its natural and beautiful state. Highly recommended.
S Green

 750ml, Clear - 420 Extra
Expensive , but good
Higher price but excellent rain repellent so far. Only time will tell if it's got pedigree!
Mark McCarthy

 750ml, Clear - 420 Extra
Excellent product
I used Osmo 420 UV protection oil on a new solid oak garden gate. I applied two coats. After the first coat was dry I sanded it with fine 240 grit paper and applied the second coat. It dried to a lovely satin finish and looks well protected. I will definitely use this product again and would highly reccomend it.
Olivia Stephens

 2.5L, Clear - 420 Extra
Gives the wood a lovely depth of colour
This product had already been used on our garage windows and doors and we liked the finish. It gives the wood a lovely golden colour, it's come up a treat! We have used twice as much as the expected amount which has been a bit costly but I think this is because the wood is rough sawn and so more has soaked in - this will hopefully give the wood extra protection. We've also been applying it on lovely sunny days so the wood is really dry.
Barry Lambe

 2.5L, Clear - 420 Extra
A very large oak gate. after 2 days sanding and cleaning 2 coats applied. a great finish.
Anthony Mitton

 750ml, Clear - 420 Extra
An excellent product which enhances and protects the natural finish of my oak conservatory
I recently had an air dried oak conservatory installed and on Wood Finishes Direct recommendation, I applied one coat of Wood Preservative followed by two coats of Osma UV Protection Oil. The result is everything I'd hoped for and the UV Oil has given a wonderful satin finish which enhances the natural appearance of the oak. A perfect choice and well satisfied!
Paul Lynch

 2.5L, Oak - 425 Extra
Excellent product at a good price with fast free delivery.
Bought to provide protection on oak fascia boards for a new house. Fairly easy to apply and providing a really nice finish after 2 coats.
Brett Francis

 2.5L, Clear - 420 Extra
Great product, will use it from now on.
We are a wooden tent manufacturer and this product has matched and exceeded all our needs.
Mark Carter Of Yate,

 750ml, Clear - 420 Extra
Excellent product
First time I'd used this product. I used it because the company constructing my cedar doors use it in their manufacturing process. I had some new oak windows to protect and this product was perfect and enhanced the beauty of the oak.
Ellie Kopiel

 2.5L, Clear - 420 Extra
Very Good.
Oil gave excellent finish on untreated Siberian Larch on wooden room built by Nordic Wood who recommended this product and your company. Only thing have had to order another tin as wood soaked up double the amount estimated. However, I am very pleased with the product.
John Nixon

 750ml, Clear - 420 Extra
Seems to work well.
Fallen in love with this expensive but worthwhile product. I use it over Barrattine stain and also straight onto wood. They say two coats is necessary for 12x the UV protection over untreated wood. So far, I'm very happy with the look and result though can't vouch for their claims. It does take a while to dry and warm weather is kind of necessary. Again, the advantage is it shouldn't flake.
Matt Turner

 2.5L, Clear - 420 Extra
Used 420 extra on exterior oak and larch cladding...brilliant!
Best treatment for oak, holds off weathering prosses really keeps the woods natural beauty on show even against uv
Donna Williams

 2.5L, Clear - 420 Extra
Easy to apply and nice finish
Applied to oak windows doors and cladding that had been weathered and then sandblasted. Easy to apply and gives us a nice natural finish. Only problem was I didn't get enough as our wood seemed to drink it! Will be ordering more. Time will tell how it protects.
Trevor Taylor

 2.5L, Oak - 425 Extra
Delivery was spot on, no hanging out as per some suppliers
Haven't used the order as yet, but having used this product in recent years know that is is an excellent product.
Lynne Hampton

 2.5L, Clear - 420 Extra
Easy to apply and dries to a lovely natural finish.
Two coats applied over 4 days and the wood is repelling rain and looking fantastic.
John T

 2.5L, Clear - 420 Extra
Excellent product, just what I needed to treat external oak cladding
This product is very good indeed. It's easy to apply, really brings out the texture of the wood and gives it long lasting protection against UV and water. I'd definitely recommend it.
Lesley Pearse

 2.5L, Oak - 425 Extra
My oak five barred gate was in a bad state, neglected for several years. Osmo oil brought it back to looking good. Simple to use too.

per litre
9 hours
dry time
  • Protects against greying
  • UV-Protection factor 12
  • Will not peel or flake

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