What do you guys think about these cheaper brand (Winton) of W&N oil colors? They have higher quantity of linseed oil to pigment ratio in them compared to Artist Oil, so obviously mixing this with Mark's SDM will produce slightly different results. Now the question is - Linseed oil makes the paint dry slower, so adding it to SDM will make it dry even slower than Mark's original setup?
Other question is - Can i use my own version of SDM like:
9 parts damar varnish
9 parts turpentine
4 parts stand oil
2 parts Venice turpentine
Or - recipes involving Stand Oil and Walnut Oil/Safflower Oil
Or any other recipe for Slow drying medium? If not, what exactly does Mark's SDM achieve apart from slowing the drying time by good amount?