Re: Flemish technique - oiling out problem
Not sure I understand. You were oiling out with linseed only. Then you accidentally got some cadmium yellow in the linseed and smeared it around with the linseed? Or do you mean the paint was all dry except for an area of cad yellow which was for some odd reason still wet, and that got smeared around?
In either case final varnish won't have the same problem if you paint is dry first, including all the yellow.
I don't have any W&N but have read several threads in the oils forum about that brand being all over the place with regards to quality. Used to be a good brand but no longer. I have OH and Rembrandt yellows, they all seem to be normal driers - not crazy fast like lead white or Burnt Umber, and not crazy slow like Madder red.
I think this thread should go under oils - technical forum, as this doesn't have anything to do with still life.
try gamvar (not dammar) as final varnish - there are multiple threads about it already.