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The developer said that the cladding would last about 10 years.

That sounds incredibly short. Did he or she perhaps mean the finish
would only last 10 years before re-treatment?

On searching I came across this producthttp://www.valhalco.com/

Sounds too good to be true.

Have a look at the Sikkens range of wood treatments, they are highly
regarded.

Seems they only have coloured finishes. I tried to email them but the email
bounced! Looks good though. Thanks