SLOP (Slimy Linseed Oil Paint) is best left in the tin. I recall seeing this term mentioned a year or so back on the forum and thought...good description.
You make a primer with SLOP, raw linseed oil and balsam turpentine. Apply thinly and it does get absorbed into the wood quite quickly. The next coat is where the fun starts. No matter how thinly you apply SLOP, it will take forever to dry. The proponents will say 'You put it on too thickly'. Nope. Applied thin as thin can be. Still takes a couple of days to dry. Sort of.
Of course, you never want to drop any on a non-porous surface because that is when your pain really starts if you don't realise it is there as it will never dry...well, after a few months maybe. It then gets transferred accidentally to another non-porous surface perhaps and lurks there to catch the unwary and ready for the next 'transfer'.
After that first ultra-thin coat has been applied, it is now time to apply a second coat. This one will take even longer to dry.
And don't forget the fun doesn't just end there. Ignore the 'All you need do in the future is simply apply another coat'. WRONG ! First go and buy some industrial mould and mildew strength remover because, boy, does that stuff like SLOP. It's a feeding frenzy for all those little spores. Weep while your carefully and painstakingly painted white outdoor building takes on that slimy grey hue as the mould gets established.
What's that, I hear you say ? 'You should have mixed Zinc Oxide in to the SLOP'. OK...good to hear after the event. Now where do they say that on the tin? No room as it's too busy extolling the 'green' advantages of SLOP.
Jacob will be along soon to tell me that I put it on too thick, that it's wonderful, all my fault, blah, blah, blah.