Osmo UV-Protection Oil Review

Updated May 17, 2024 | Posted Nov 13, 2017 | Product Reviews, Paints | 3 comments

After recently using Osmo UV-Protection-oil recently, I thought I would write a review on the product. I will admit to being slightly biased towards Osmo as I am already completely sold on their other Anti-Slip Decking Oil. In fact, their whole range is spot on in my opinion. Click here to see online prices.


Technical information

  • Approx. coverage: 18m²/L with one coat
  • No. of coats: 2
  • Application temperature: +5°C to 35°C
  • Drying time: 12hrs.
  • Sizes: 0.125L, 0.750L, 2.5L

Osmo UV-Protection oil covers around 15-16m²/L with one coat, which isn’t as much I’d like from a product; however, this was from the wood already being silvered.


My Osmo UV-Protection Oil Review


Two coats and the timber looked amazing!! In fact, it looked pretty good after one coat!! You need to work the Osmo UV protection oil into the timber on your first coat. The product penetrates the timber and brings out the grain. A quick sand off with some light sand, dust down, then you’re free to apply your second coat which is a dream to apply. You’re left with a rich finish like nothing I’ve ever seen!

The drying time is around 18- 24 hours. This is an inconvenience as the tin states that the optimum temperature is +5°C to 35°C, which in the British Isles is not always possible.

The oil transforms silvered Oak almost instantly, giving it a stunning colour and bringing the grain out as we all know a decent oil should.

The consistency is also really nice. It was quite viscous, making it flow easily off the brush. I did notice it went a lot further on the second coat.

One of the key benefits of this product is that when once it has being used, it doesn’t need sanding prior to future applications. this is because it is microporous. This means it protects the timber from the whether, but doesn’t trap moisture in the wood. Osmo UV protection oil will also cope well with timber expanding and contracting with the weather.

The advantages of Osmo UV-Protection Oil are as follows;

  • Very water and dirt resistant
  • Reduces wood swelling and shrinkage
  • 410 Clear is safe for humans, plants and animals once dry
  • 420 Clear contains biocides to resist the growth of algae, mildew and fungal attack
  • Microporous, breathable finish – does not crack, peel, flake or blister
  • No sanding necessary for future applications

You can buy Osmo oil online. Click here to see current prices.


 Three Years After Using Osmo UV Protection Oil


It is now a couple of years after I originally published this review. I thought I’d come back and add to it, having learnt a little bit more about Osmo UV protection oil. It turns out it doesn’t last as long as some of the other timber care products which are available. Ideally you should apply at least one “top-up coat” every year. This is ok as long as you bare this in mind and stay on top of your external maintenance. You may be better with Fiddes HD oil on your project.

Another downside of Osmo UV Protection oil is you can’t apply it over the top of a previously sealed surface. You can apply it to bare timber, or over the top of itself. What you can’t do is apply osmo oil over the top of stain or varnish. This is the same with any wood oil.


Best Tools to Apply Osmo UV Oil


I thought I’d include a little section on the best tools to use when applying this type of material. Osmo recommends their own Flat Brush, which is cheap and will do the job. But for me, the best brush for Osmo UV Oil is the Kana Tank.

The Kana Tank brush comprises of an inner core made from natural fibre bristles, which are then encased in synthetic bristles. The natural bristles hold onto thin material like Osmo Oil, and the synthetic ones help you manipulate it into the timber. Using this paintbrush will help make your life easier when applying the oil. Click here to see online prices.

You will also need a clean paint kettle, some fine grade sandpaper or wire wool, and a tact cloth to pick up any dust.

I hope that helps.


Osmo UV-Protection Oil Review - Decorator's forum UK

Osmo UV Protection Oil is a translucent material used to coat exterior timber. It looks good, and protects the wood.

Product Brand: Osmo

Editor's Rating:


  • Very water and dirt resistant
  • Reduces wood swelling and shrinkage
  • 410 Clear is safe for humans, plants and animals once dry
  • 420 Clear contains biocides to resist the growth of algae, mildew and fungal attack
  • Microporous, breathable finish – does not crack, peel, flake or blister
  • No sanding necessary for future applications


  • It doesn’t last very long.
  • Can’t be used over previously sealed surfaces.
  • Quite expensive compared to others.

Updated May 17, 2024 | Posted Nov 13, 2017 | 3 comments

About the Author

About the Author

Mike Cupit has been in the decorating industry since 2002 and has mostly worked as a Trade Decorator in the domestic sector (peoples’ homes). Self-proclaimed “product geek”, Mike has a passion for paint and decorating tools. Mike now spends most of his time testing paint products and tools, comparing them to similar products on the market, and blogging about the industry in general.


  1. Sandra Sturmey

    So happy with the product initially after applying it to a new cedar wood garden room. After 2 years the most awful blisters appeared on 3 sides, not the back which is sheltered. Osmo were helpful to begin with sending paint stripper and a 250ml tin of 420. 3 years later its horrendous its ruined the whole look of the garden room. We did exactly what it said on the tin. Osmo not coming forward to help.

  2. Ed Vachal

    I am terribly dissatisfied with OSMO UV Oil. I’m applying it to a quarter-sawn African Mahogany, and white hard maple shelf for our Trager grill. The finish is horrible. It streaks, bubbles, has swales, and even some blisters. I sanded the shelf to 180 grit, stirred the OSMO a hundred times, keep the shop at a constant 60 to 62 degrees F. Applied with an appropriate wiping rag. Let it sit overnight, then sanded all the “bumps” off and finished to 400 grit. Used a tack cloth, and applied the second coat. WORSE! Huge ripples, bumps, blisters.

    I don’t know what to do now except to sand it down to bare wood and get some “cheap” product from Home Depot and go with that.

    Does anyone have any Ideas??? My conclusion is that this product is crap.

    I have OSMO on the dining room table I built. It is SUPER great. Why the disparity??? Please help. Thank you. Ed

  3. Maria Benham Frary

    Hello what I want to know is after applying osmo red cedar uv protection oil to the outside of my cabin —-2 Coates is it possible to use the same for decking surrounding— partly of which I put a horrible light oak colour— for decking last year? Thanks Maria


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