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Originally Posted by Chris Saper
I actually use paints and mediums that dry so quickly I routinely scrape off my palette and put out fresh colors by noon each day.
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Chris, you have got to be talking about Studio Product's Underpainting Medium, which I tried for the first time today. I've never tried a medium which set up so fast.
Joan, there's a lot written about Liquin if you do a search on the Forum. Personally, I don't use it as a medium anymore.
The reason to let your paints dry and then to paint over them is to allow you to employ paint in different ways. You can scumble (paint without medium over dried paint) or glaze (paint suspended in medium). Each allows for subtleties arguably not achieved in a strictly alla prima method.
I keep my biggish blobs of paint in a Tupperware container in the freezer. I don't save my mixtures, usually because I've fiddled with them too much, but I think there's a lot of merit in what Marvin says: bringing a fresh mind to contemplate the colors in the mixture for the next day's work is a good thing.