Interesting. I've just ordered some Old Master's Maroger to try.
I'm a Linseed Oil artist user. I just like the ability to be able to blend my artist colors at a wide range of times. I do find that say after maybe four days the oil paint on the canvas has dried enough to brush on a top covering. http://lloydthibodeau.com/
I use it sometime too , but carefully . i find I add it more so to a larger work than smaller . As to other additions on my fairly vast collection , I am taking a trip , not too far , to a town called Bancroft , Ontario , where an old above ground mine is FREE TO ROAM at will . Still abundant . I'm there planning to pick up a few Quartz Lapis Lazuli and maybe Malachite. Possibly have to buy that somewhere in town The subtle beautiful colors of cloud , and the radiant vermilion..I need the radiance. Grind myself and squeeze it out . I'll remain hopeful they have more.
It depends on the type of painting that you are doing. If you are painting wet in wet which seems to be very popular these days, A very fine coating of linseed oil on your ground (which can be acrylic) and then wiped off with a paper towel, allows your paint to flow and blend on your canvas. If you are doing a more conventional painting building up over layers, you need to remember the old adage 'fat over lean' where fat refers to the amount of oil in the medium as opposed to the amount of thinners or lean. You need to use more thinners or turps in the under painting, building up the amount of oil as you proceed, finishing off with possibly paint straight out of the tube. The reason for this is the different drying times of oil and turps. If you put a fast drying medium on top of a slow drying medium the paint will crack.