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.
Review Summary
Jotun Demidekk Ultimate Review - Decorator's forum UK
A water-based ‘trim’ paint, used to coat exterior woodwork such as doors, windows, and just about anything else.
Product Brand: Jotun
4.6
Pros
- Water-based.
- Fantastic longevity.
- Excellent adhesion.
- Flows brilliantly, so it’s a joy to use.
- Great finish.
- Durable.
- Opacity in colours is great.
Cons
- Not widely available.
- Opacity in white isn’t very good.
Where to buy Demidekk Ultimate?
The Paint Shed for me. Not just for Jotun Demidekk, but they have thousands of products on there. All trade, all at competitive prices, and free next-day delivery is you spend over £75. It’s a no brainer for me.
FAQs
Does Demidekk Ultimate need a primer?
Only when painting bare wood really, then you’d use Visir, which is a clear, water-repellent material. It’s easy to use too. The only issue is it has a 24-hour recoat time. Demidekk Ultimate has great adhesion, so you can use it over previously painted surfaces without the need for a separate adhesion primer.
How many coats of Demidekk Ultimate?
Two coats are usually ample to achieve a colour change. Bare timber might take one coat of primer, followed by three coats of Demidekk Ultimate.
How long does Jotun Demidekk take to dry?
One of the advantages of using this product is its short drying time. It’s touch dry after an hour, and you can close windows and doors two hours after painting them.
Is Jotun Demidekk waterproof?
Demidekk is waterproof as soon as it is dry. It is also resistant to UV and flexible enough to cope with exterior timber.
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.
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.
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
I’m happy to give a Jotun Demidekk Ultimate review.
It’s 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!
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.
It used to be called Butinox and great gear to use. Bit pricey, but worth it.
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.
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.
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.
I thought opacity was rubbish in white 🤷 It might be different in tinted colours.
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.
Love the stuff… fantastic coverage… and as far as I’m aware it holds up nicely to the weather hence the price tag!
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 Paint Shed. Here’s my own cabin.
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 👍
Demidekk is good paint. Sets quickly in the heat though, so get it on quickly and don’t faff around
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
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
Our shed has been painted with Butinox over the years can we paint on top of that with demidek?
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.
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
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?
Good gear, an impressive finish get from PPG
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.