Thank you all for the answers,
As Mark says, there is no obvious choice. This said, even if there is a learning curve, I’ll give a try to the following, in this order :
WMO’ s (I just discovered the acronym for Water Mixable Oil, I learn everyday : - ) ) , but here,I’ll have to test Cobra (thanks to Nicholas) and Holbein. What is not really clear is the question of mediums, it seems some can be used with any WMO brand, others are for a specific brand (?).
Schminke Medium W which is supposed to transform oil paint in WMO.Not sure if the consistency would be "right" for flats ?
Gamsol . This looks very interesting. I must thank Joe for this. I knew vaguely Gamblin colours existed, but as they are not widely distributed here, to say the least, I never had a look on these products, even less on Gamblin mediums.
Acrylics with Kimera, and probably some artists acrylics at a later stage : Liquitex acrylic Gouache ? Golden Open ? Golden SoFlat ? I still have many Vallejo colours, I just had problems with mixes, which at times gave strange results (I still wonder why). It’s also clear using a wet palette is mandatory. But, as I understand the problem, painting very smooth transitions using only acrylic is a very different technique of painting compared to oil painting.
It was also pointed out rightly that the products used in painting have all their issues, acrylics included (interesting paper on Jackson website)
If I understand well, using watercolours would be safer than anything else.
I know some people paint flats with watercolours , but here I’ll have to pass !
And my apologies, Nicholas, with family duties I can’t go to Eindhoven , but I’ll remember the offer, thank you.
Best Regards,
Jean-Marc