or "What the manufacturers' would rather you didn't know".
I hereby irrevocably and without any constraint or reservation withdraw all of my recommendations and good words written in support of this vile product.
The 'dirty little secret'? Mildew. Not helped when the manufacturer once posted this on their website (now withdrawn)....
It was a lie. This is the reality.
The only option I see is to contact the technical department of a proper paint manufacturer like Zinsser and seek their advice.
The solution that I now realise is to stuff the linseed oil slop with zinc oxide. But since the manufacturers go to great lengths to tell us how wonderful and ecologically friendly their crap product is, adding poisonous zinc oxide is hardly green.
Do NOT EVER, EVER, EVER use linseed oil slop.
And no, I have no idea why the forum has decided to rotate my photos.