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.

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Jotun Demidekk Ultimate Review