i dont know....but i am using liquitex slow-dri blending medium. i am mixing a bit at a time and am getting some great results. it has no directions but to add the chemical to it. my mini is drying a slight bit glossy but other than that it is fine. i just want to put it into my bottles and not worry about mixing it each time i make a new color.
I think that\'s why most people mix their flow extender, improver, whatever all else is in their special mix, in their water bottle they use to thin their paints. The downsides for this method are 1>you\'ll probably want to get a dropper bottle (only a downside if you don\'t like dropper bottles) or at least a paint pot for your water and 2>it will affect your paint differently depending on how much of your water mix you use to thin your paints, so it can become a little unreliable when doing different things and also 3>you usually need to make sure your WATER is mixed up...which is just odd to my way of thinking. Lastly, 4>some things don\'t last that long once you start mixing them up, if you rarely paint, like me, could be a wasteful practice. I think most of the more widely used things last more than long enough after mixing, but I\'ve seen a few that don\'t last more than a few days.
I\'m lazy so I think it\'s still the best option, plus it\'s probably more reliable and less wasteful than mixing each puddle of paint you use with your additives, which eliminates all the real downsides, as far as I can see.