I normally want my oils to dry slowly so I love the Geneva paints, and also Mark's recipe for slow dry medium. However, I'm now venturing into plein air painting and want my plein air paintings to dry faster. So have been looking into different fast dry mediums for use with regular oil paints.
I would NOT try to use a fast dry additive with Geneva!
Has anyone Used Cobalt Drier? I have a bottle of the Grumbacher Cobalt Drier, and the only information I can find on how to use says to add is "sparingly by drops" to the medium, and not to the paint. I can find nothing on how much medium per drop. It seems that there would be a recommendation as well as a warning on how much is too much.
Is anyone aware of any recommendations on using cobalt drier other than "sparingly"?