Sun thickened is partially polymerized, whereas Stand Oil is thickened in the absence of oxygen at temperature.
Try mixing your medium 1 part oil to 1/2 part Venice to 3 parts turps or spike.
I do this with Stand Oil, Canada Balsam and Spike - 1-1-3. I would reduce the amount of resin to 1/2 part if you use Venice Turps over Canada Balsam.
It will be touch dry in about 1.5 - 2 days depending on volume of medium to paint.
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