Jotun Demidekk Ultimate Helmatt


We no longer stock this product, but can recommend Remmers Aqua VL-66/sm-Venti Coat 3in1 as a great alternative.

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This Product has been Discontinued


We no longer stock this product, but can recommend Remmers Aqua VL-66/sm-Venti Coat 3in1 as a great alternative.

Jotun Demidekk Ultimate Helmatt is a high quality, water soluble, opaque wood protection coating for exterior use, based on AMA (Alkyd Modified Acrylics) technology. The advanced binder technology in Demidekk Ultimate Helmatt gives the paint very good colour stability and long mainitenance intervals. The product gives the substrate a completely mat, elegant apperance which contains effective film conserving agents that counteract mould growth on the substrate.

Jotun Demidekk Ultimate Helmatt is easy to apply and has a rich consistency. Recommended for new primed, previously stained or painted exterior woodwork.

The substrate must be clean, sound and dry: Fresh wood left untreated for more than 4-6 weeks should be cleaned using a suitable cleaning agent and brushed with a wire brush. Previously treated wood should be cleaned using a suitable cleaning agent. Observe use instructions. Remove loose paint and wood fibres by wire brush or scraping.

Substrates previously treated with limewash must be treated the same way as other previously painted substrates. However, the pretreatment must be done with extra care. Limewash paints are loosely bound paints with a small amount of binder. This will cause chalking, which means that the substrate will be dusty and release colour when touched. To obtain a good substrate, remove as much old limewash as possible by washing, brushing/scraping. The substrate is also often infected with algae and mildew so a suitable anti fungal treatment should be applied according to directions to brushed/scraped substrate. Bare spots (from drybrushing/scraping) to be primed with either Jotun Visir Clear Primer or Jotun Visir Pigmented Primer. There is a great risk that pigment residues on the substrate after thorough pretreatment, may penetrate the new paint layer. Thefore, a colour close to the origin is recommended. If a significant colour changes is desired (lighter colour), the substrate should be sealed with a suitable stain blocking primer prior to application.

Apply a suitable anti fungal treatment in accordance with the user instructions.

Bare, fresh wood to be primed with 1 coat Jotun Visir Pigmented Primer. Use Jotun Visir Clear Primer during the cold season when the air and surface temperature is below +5°C. The primer must be brushed out thoroughly. Apply 3-4 coats wet-on-wet to the end grains/cut surfaces.

New, planed woodwork: 3 coats Demidekk Ultimate Helmatt. Previously treated and new, unplaned/rough woodwork: 2 coats Demidekk Ultimate Helmatt.

Contents of tins with different production numbers should be mixed. Stir well before and during use. Coating on fire protected cladding may cause salt precipitation/flaking. Previous tar/mineral oil treatment and knots may cause discolouration/blistering of the topcoat. Perform a test application. Sun on semi-dry paint may cause skin drying and sun blisters. Condensation may cause dull patches. Linseed oil may cause blistering of future paint layers. Please be aware of linseed oil/moisture problems. To ensure long durability it is important to apply a sufficient amount of paint on edges and planed surfaces. Min. 3 coats (100 μm dry paint film).

Product Details

Data sheet

Brush, Roller, Spray
5 - 14m² per litre
Touch Dry

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

questions JB McGuire on 2019-05-24 10:30:35

Seeking to recoat exterior wood cladding with black (not ebony as it dries brown) Futura matt finish. This would be a ten litre tub, delivered to EH39 5PW. Grateful for your price please to include VAT and any delivery charge with approx delivery date. Thank you.

Answer from Rawlins’ Technical Team: 

Jotun Demidekk Ultimate Helmatt doesnt specifically come in a colour called 'black' so instead we would suggest using Zinsser AllCoat Exterior Matt (Water Based) which is available in a standard black colour.

Pricing is as per the product page on our website and we can offer a 3 - 5 working day delivery for FREE, 2-3 working day delivery for £8.00 + VAT and a next day delivery for £15.00 + VAT.

questions Ruth Marshall on 2019-03-28 17:52:06

Hi there we are looking to paint some binstores (we believe they are actually bike stores). They have never been painted before (they are three years old) - just with the pretreatment on them when supplied. Want to use Jotun Demidekk Ultimate Helmatt (matt finish) and have the paint colour fandeck for the product. The colour we would like is 92 - Herregard (1909-Y02R) but this is not available on your drop down menu. Is it possible to get this shade? We require 2 x 3litres. I look forward to hearing from you, Kind Regards Ruth Marshall

Answer from Rawlins’ Technical Team: 

We can produce this colour in Jotun Demidekk Ultimate Helmatt, if you would like to order please call our sales team on 0113 2455450 (option 1).

questions Reg Stables on 2019-02-20 16:23:25

Hi, I have a 3m x 4m garden shed clad with softwood shiplap cladding previously treated with Sadolin Classic Natural, (although it appears quite dark now after a number of coats over the years). I live in a coastal area and the Sadolin has weathered such that in a few areas on the South facing side (sun and wind!) it is starting to flake. The remainder of the shed on the other three sides is sound. It has been painted with the Sadolin two or three times in 4 years since new. I am looking to treat the shed with a product which hopefully will last longer than the Sadolin and also a coloured finish lighter than the Sadolin, possibly RAL1000 with a satin or matt finish. I appreciate trying to get a lighter finish is not always easy and pretreatment may be needed. Looking at your website I appear to faced with a number of product choices and just need guidance of which product best meets my needs. I hope you can advise me. Regards

Answer from Rawlins’ Technical Team: 

Jotun Demidekk Translucent Woodstain is the only one in the range that is translucent, Jotun Demidekk Ultimate and Jotun Demidekk Ultimate Helmatt are both opaque coloured finishes. Any would be suitable after adequate preparation but Demidekk Ultimate would provide the longest protection. 

Question about the product

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Jotun Demidekk Ultimate Helmatt is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

All delivery costs below are excluding VAT

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