I am used to painting out of plastic jars with acrylics already mixed to my preferred consistency. However, now,I am switching to oils. Several weeks ago, I mixed my oils from tubes into plastic paint jars and added Odorless Mineral Spirits to get the right consistency. I like to paint in a very expressionist way and don't want to stop to mix paints. I am happy to have the paints dry in 24 hours. Then much to my dismay most of the colours developed a skin in the jars. THEN I discovered your website and how you mix your paints from tubes into Mason jars to get the right consistency for your painting with your own special medium mix. So, I am wondering if I just added more linseed oil, or safflower oil, depending on the original mix in the oil paint, whether that would help prevent the drying in the jar, but still allow me work freely with a consistency I like and not take too long to dry. I suspect that your medium might take longer to dry than I would like, but I could not find any mention of it on your video. Other, than that, it was suggested, I drop in a little water on top to prevent the coating forming before I finish up a painting session, or turn the jars upside down to prevent the skin from forming.
Any suggestions would be most welcome.