the Bedec is certainly expensive, but it all depends on the longevity. Nothing beats your own personal experience, but I will have to wait another few years before I will know if it was worth the extra.I have been using Cuprinol Ducksback from Toolstation about £13 for 5l i.e. £2.70 ish per ltr
I see Toolstation offer Bedec barn paint at £58 for 5L i.e. £11.50 per sq ltr
The ducksback on an outside rough sawn fence looks good-ish after about 3 yrs, I am considering perhaps painting again this year.
BUT brambleboy & me welcome any further advice from persons who may advise us to use Bedec barn paint if it will give us many more year between painting.