Jean:
That is one benefit of the mixture with Canada Balsam and Spike - it smells like a pine forest!
When you use it depends on how many layers you usually build, and frankly how thick you lay in the paint. I know one artist that mixes a "lean" version for lower layers that has 4 parts spike rather than 3.
If you build a lot of layers thinly, you should be ok to use it from the mid-layers on, being mindful of the % of medium to paint.
Without a doubt, this is not a "fast" medium. It is great for plein aire, oil sketches, alla prima work, or for passages where you will not go there again for a couple of days. If you need to paint again the very next day, you may want to consider a medium that has a drier in it like Maroger, or an alkyd, etc.
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