Jotun Demidekk Ultimate Review

Updated May 19, 2024 | Posted May 8, 2020 | Product Reviews, Paints | 8 comments

Demidekk Ultimate is a fully waterbased external opaque, with flexibility and mould growth inhibitors. Very similar in feel to Zinsser Allcoat which is probably the brand leader in this type of product. I’d say Demidekk Ultimate is a step up in terms of quality and overall finish. Recoat time is 4 – 5 hours depending on conditions but touch dry in around 2 hours. This product can be tinted to most colours.

Demidekk Ultimate is a fantastic product in my opinion. Excellent to work with and levels nicely with a subtle sheen. Use the Demidekk primer if you’re coating bare timber. I always feel it’s important to follow the manufacturer’s instructions to the letter, particularly on an exterior. That said, if you’re using Demidekk Ultimate on previously painted timer then you’re good to go with 2-top coats.


The lifespan / longevity of Demidekk Ultimate


I thought I’d give this topic its own section on my Jotun Demidekk Ultimate review, because for me it is the most important factor. You are using a water-based product on the exterior of a property with no adhesion primer on a previously painted surface. That is a big ask, especially in the Great British weather!

I’ve been back to jobs where Demidekk has been applied over 5 years ago and still holding up really well. This is the only product of it’s type that I have faith in as a professional decorator. Although it is water-based, Demidekk Ultimate will stand up to the wear and tear that comes with coating a door or window, expand and contract with timber and still last for years. It is not the cheapest on the market, but you get what you pay for.


Where to buy Demidekk Ultimate?


The Paintshed for me. I live close enough to have a trade account, but I know anyone can buy it online from there. I’m sure there are other places too. CLICK HERE to visit the Paintshed.

Jotun Demidekk Ultimate Review – by Scott Murphy


What do Other Decorators Think about Demidekk?

Coverage is great with Demidekk. Dries nice and quick but near impossible to sand between coats as it’s rubbery, so make sure everything is prepped up properly before hand.

Gary Berston

Demidekk Ultimate is probably the best exterior multi-surface paint of its type. You’re asking a water-based paint to adhere to various surfaces, including old alkyd coatings. Demidekk Ultimate seems to do it without issue and lasts for years before it starts to age. You get a nice finish with it too. No stringy brush marks and it settles down lovely.

Sam James

I’ve got to say, I really like it!! I think you’ve covered every base in this review. My normal “go to” exterior paint has always been Dulux Trade, which to be fair is generally pretty good. The only issue with Dulux Trade is their water-based timber paint products really don’t last.

Demidekk Ultimate may be pricey, but to be able to achieve the finish you do and know it is going to last as long as most oil-based products really is priceless. Not just that, but the speed you can apply this stuff is great too. Plus, it doesn’t wreck your brushes like some other water-based paints do.  This is probably the very best product on the market for exterior doors and windows. Honestly, it’s worth every penny.

I get mine online at the Paintshed too

Mike Gregory

Not as readily available as other brands and some customers may need convincing as they won’t have heard of it. It’s worth seeking out. I find Jotun Demidekk really durable, so it’s perfect for exterior doors and windows. Easy to use, great finish and it lasts, brilliant product!

Matt Tidd - Jotun Demidekk Ultimate Review


Demidekk Ultimate a really good quality opaque paint. Great adhesion, rich colour, nice finish and not too many brush marks. It’s perfect really, much better than some of the oil-based alternatives.

Mark Sutton

It used to be called Butinox and great gear to use. Bit pricey, but worth it.

John Blades

Excellent stuff!

I used it to paint a new wooden cabin in my back garden about 7 years ago and there is still absolutely nothing wrong with it! It gets full sun on the front of it and it’s still in great Nic! You don’t expect water-based paints to last, but Jotun Demidekk is fine.

Mark Worcester

We have been using Demidekk for many years more than I like to admit😬. It is fantastic and was well ahead of the pack and for me still the best. Its only fault is it lasts too long 😂We have tried many of the more at hand products Johnstone’s opaque and dulux, and for me they are not a patch on coverage and longevity, Jotun all day long.

P Myers Ltd

Got this recommended to me last year and I found it to have great coverage and easy flow. So great on exterior wood and decent choice of colour range. Paint Shed colour match to other brands too.

John Collins - Jotun Demidekk Ultimate Review


I thought opacity was rubbish in white 🤷 It might be different in tinted colours.

Neil Potter

Demidekk Opaque stain is the best on the market in my opinion. It is a little pricey but worth it for the longevity.

A close second is the Technos Woodex Aqua solid which is slightly cheaper.

Ian McDiarmid

Love the stuff… fantastic coverage… and as far as I’m aware it holds up nicely to the weather hence the price tag!

Jamie Bennett

Love it. Use it mainly for colours on externals as you no longer can get Butinox. I use Johnstone’s opaque for white (cheaper). I get all my paint online from the Paintshed. Here’s my own cabin.

Juton Demidekk Ultimate is the best coloured exterior paint for woodwork

Murray Young

I remember when Demidekk came on the market over 30 years ago. Used it on my outside facias and soffits 3 years ago and still looks as good as new. Great product 👍

Maureen Turner

Demidekk is good paint. Sets quickly in the heat though, so get it on quickly and don’t faff around

James Hunter

Updated May 19, 2024 | Posted May 8, 2020 | 8 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. Trevor Henson

    Demidekk been using it for years absolutely great stuff get it from brewers . good for going over old windows that are past useing semi translucent stain. Brown mahogany mixed by Brewers

    • Steven Duff

      Hi, going to be using this product for first time over the top of previous oil stained wooden cladding. Does this take well on top of oil based given that it is water based? Stevie

    • Alice Sutherland

      Our shed has been painted with Butinox over the years can we paint on top of that with demidek?

  2. Roger Dyndal

    I started using Jotun Demidek 4 years ago. I live on a large 10 year old estate which unusually has wooden windows. I get most of the exterior jobs and initially used Jotun on the recommendation of Brewers. It stands the test of time very well indeed and is easy to apply. I use Dulux aqua base coat where necessary. Much quicker drying time than oil based. The white paint has a brilliant but flat finish which hasn’t died with time. All of my customers have been happy.

  3. Neil

    Is it essential to use undercoat on new timber and if so what is recommended? This is for bee hive parts which is best with water based paint. Neil

    • Janine Lawlor

      Hi Neil
      I am also a beekeeper and was considering using Jotun Demidekk but was concerned whether it was safe to use (I have always used Cuprinol Garden Shades in the past)
      Did you use it to paint your hives?

  4. richard

    Good gear, an impressive finish get from PPG

  5. E Darby

    It’s a Norwegian paint and you should see how they test it for durability; paint it on plywood sections, bolt it to a steel frame which is situated on rocks meters from the ocean. They leave it there for years and it takes whatever the ocean throws at it along with the severe Norwegian winter. Seriously impressive.


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