Wanting - everdure

[Bittersweet89 0]

Does anyone have any everdure they’d be keen to sell? North shore based

[waikiore 523]

Everdure is now just highly thinned epoxy, when the solvents flash off it leaves a porous film, thus you are paying a great deal for not much. All the active highly toxic ingredients were removed around 1981

[Frank 229]

1 hour ago, waikiore said:

Everdure is now just highly thinned epoxy, when the solvents flash off it leaves a porous film, thus you are paying a great deal for not much. All the active highly toxic ingredients were removed around 1981

I recall it contained Pentachlorphenol 

[Bittersweet89 0]

Thanks for that, what would one use to seal kauri decks before painting with 2 pot?

[Priscilla II 493]

I have been using this for years does what it says.
https://www.trademe.co.nz/a/motors/boats-marine/parts-accessories/other/listing/5947961191

[LBD 227]

The Norski two pack timber sealer also includes the Biocides that Everdure no longer contain... I contacted Norski and asked for my own use.

[Psyche 955]

On 24/05/2026 at 3:24 PM, Bittersweet89 said:

Thanks for that, what would one use to seal kauri decks before painting with 2 pot?

It depends on what kind of deck, is it caulked, glued strips, 2 skin or something else?

If its not caulked  i.e. no seam with cotton in it then just use epoxy primer. You do not need everdure or its analogues- but if you really want to "seal" it then you could use neat epoxy. Warmed and rolled on, but epoxy paint is doing the job anyway.

If it's caulked then I would not use epoxy

West did a study on this years ago, essentially full solids epoxy is as effective as everdure etc, what you are doing is creating a waterproof film which only penetrates a millimetre or so max on flat grain, end grain is a little bit different but even then all you want to do is seal it to prevent moisture ingress. Even if it could penetrate all the way through which it can't, what's the point since water gets in from the outside.

Was big in the 70s before people understood that essentially all you were doing was paying for a whole lot of thinners. Super thinnned epoxy (everdure etc is about 70% thinners) is promoted for house renovations to "restore" rotten window sashes etc instead of a proper repair.  It soaks into the degraded cellular matrix then gets bogged over... it's a cheap solution. 

Some people like thinned epoxy as a primer, but isn't that what primer is for?

[Frank 229]

On 25/05/2026 at 4:33 PM, LBD said:

The Norski two pack timber sealer also includes the Biocides that Everdure no longer contain... I contacted Norski and asked for my own use.

Interesting , on the container label the only secret sauce ingredient listed is " 1-10% Cashew Nut liquid" the others are Benzyl alcohol, aliphatic amines, isopropane and xylene, I don't think any of these are biocides. I would be concerned if they contained unlisted ingredients as  NZ law requires that all hazardous substances are on the label, I've contacted  them for the MSD, its made in Plimmerton.

[Frank 229]

Update: Norski were helpful and directed me to the MSD according to that it contains a fungicide but it does not specify which one and nothing is mentioned on the label. I have asked them for the specifics. 

[Frank 229]

On 25/05/2026 at 7:47 AM, Priscilla II said:

I have been using this for years does what it says.
https://www.trademe.co.nz/a/motors/boats-marine/parts-accessories/other/listing/5947961191

I checked with these guys its epoxy and a thinner no biocides.

[Psyche 955]

Rot needs moisture and oxygen in the right amounts, dry rot is a misnomer.  Sealing with epoxy stops water getting in and as long as the timber is dry its not going to decay so why do you need biocides?  The proper way to repair rot is cut it out (some distance from where it appears to stop) and replace with good timber. To kill rot an excellent biocide is ethylene glycol.

[Frank 229]

I had an excellent in-depth response from Reid McDonald at Norski re what the Biocide component is in their epoxy sealer, here are the salient points as written.

Our Epoxy Timber Sealer contains a very low level (less than a third of 1%, by weight) of a substance that is mainly used to inhibit the growth of contaminants in the container (before the two parts are mixed) but also are present in the mixed formulation

The additive we use is free of Formaldehyde & Halogens

Examples of the types of products that include a biocide are:- 

• Paints and coatings
• Adhesives (animal, vegetable, natural rubber, polyvinyl acetate)
• Polymer emulsions and waterborne polymers
• Printing inks, fountain solutions, and photoplate processing chemicals
• Household and janitorial products (soaps, detergents, waxes)
• Sealants, fillers, and ceramic glazes

There was a bit more but overall a very helpful and customer focussed response, if this is indicative of their product quality it must be good.

In summary

Norski has a fraction of a percent of a Biocide to avoid degradation of one component prior to mixing, its unclear if this has a secondary effect on the timber but it seems unlikely at such low concentrations.

Optiseal (the Trade me product) has no Biocides at all .

I have no data on Everdure but if the above two product's are optimised and complaint with approved hazardous substances I think its fair to assume Everdure is the same

Overall it seems the comment from Waikiore also applies to the Norski and Optiseal epoxy sealer/preservatives'. I still think its a worthwhile  treatment regardless of the brand.

 

[Priscilla II 493]

On 29/05/2026 at 5:33 PM, Frank said:

I still think its a worthwhile  treatment regardless of the brand.

Yup , I use it liberally as epoxy sealer gives the timber more density before applying primer coats and penetrates end grain and crevices brilliantly.

[Frank 229]

Agree, I'm using it on repairs to my weatherboard house , buts its my el-cheapo DIY thinned resin version :-), nice Dinghy BTW