Untreated exterior timber - undercoat required?

[Shalebing]

I am replacing some of the T&G cladding on my timber garage but I wasn't able to obtain treated timber. I intend to give it a couple of coats of Cuprinol Ducksback treatment but should I also give it some sort of undercoat first and if so what would you suggest?

[OchAye]

No undercoat. There are some clear treatments at least cuprinol?, ronseal, and sadolin make them but I don't know if they are meant to be used as a first coat or when there is a problem (woodworm or dry rot).

See what ducks back recommends for new planed wood.

[ayjay]

See what ducks back recommends for new planed wood.

........and check that it can be over-painted - a quick look at the blurb says "Wax enriched water repellent"

[OchAye]

See what ducks back recommends for new planed wood.

........and check that it can be over-painted - a quick look at the blurb says "Wax enriched water repellent"

Once it weathers properly 3+ years? it could be painted but then it flakes, so you get tied into using more of the same or trying to scrape it off . I notice my stock of cuprinol - which was meant to be just penetrating - has gone the same way. Corners of some new treated wood I had used it on are losing a crust of the stuff :-(

[Shalebing]

Thanks for the responses guys. I'll double check what the Cuprinol says on the tin but I'd imagine no undercoat is needed.

[Shalebing]

Now that's interesting. Just checked on the can and this is the advice for bare wood. Now what would you class as an "appropriate wood preserver"?

[ian gibson]

There's plenty of different wood preservers available in decorators outlets, Blackfriars do a decent one and Sadolin do too. Important to remember to leave the wood preserver for 48 hours before over coating.

[OchAye]

You are caught in the bullshit marketing of Akzo Nobel (which owns dulux, ronseal, cuprinol and others).

As I mentioned above there are wood treatments (preservers) as Ian mentioned too. Cuprinol makes them too, here is one and they have another one somewhere, here is their full list of the cuprinol products.

And a Sadolin preserver.

Ideally you want a combined preserver protector and ducksback is not it. I doubt though the rest of the garage has had the full treatment in its past life.

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BTW. They are not undercoats, undercoat is something that is used to help the top coat stick

[OchAye]

PS. Sorry if I sound p*****d off with Cuprinol. I was using it for years, it was good, but the last lot I bought which I am using now is more like pointless paint.

[Shalebing]

Ideally you want a combined preserver protector and ducksback is not it. I doubt though the rest of the garage has had the full treatment in its past life.

Thanks for the info. The rest of the garage has been painted using Ducksback for quite a few years but it was treated timber to begin with. As mentioned this replacement shiplap is untreated which led me to raise the query.

[OchAye]

I would just use Ducksback as you got it.