Demidekk Ultimate Review - an exterior long lasting paint for windows and doors

Jotun Demidekk Ultimate Review

By Scott Murphy



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 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.


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

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. Easy to use, great finish and it lasts, brilliant product!

Matt Tidd - Jotun Demidekk Ultimate Review

It used to be called Butinox and great gear to use. Bit pricey.

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!

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.

John Collins - Jotun Demidekk Ultimate Review

I thought opacity was rubbish 🤷

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 this 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

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Jotun Demidekk Ultimate Review