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Just had a look at the spec for the Bedec Barn paint. Looks like it's designed to cover anything including creosote. Suggests that it's useful for large weathered buildings where you don't want to deal with individual patches of pre existing coatings and the overall finish is more functional than decorative.
I don't really trust a paint that says self priming. Primer or undercoat or both is almost always going to be better at gripping the wood or old coating and providing a stable grippy opaque background for the top coat.
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I think I mentioned this before here ages ago, I have some big love for this paint. I used to use expensive dulux paint, went to buy some more and the man from jempsons suggested this stuff: never looked back, about half the cost of dulux too. I used it to fully repaint old weatherboard house, at least twice probably three times in 15 years, it’s dries with a slightly flexible coating, very very forgiving, can get it mixed to any colour, would highly recommend
Bedec Barn paint, talk to me. I heard good things about it and renounced my Sadolin Superdec habit to use it to paint our building's picket fence. Bit by bit, because I am having to remove the pickets because they weren't fully painted before first assembly and the wood between pickets and rails is starting to rot and needs treatment.
It says I don't need a primer, but 20 pickets and two coats in, it looks like it does. Superdec certainly doesn't. I am regretting my urge to explore rather than exploit.