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Retouch, oil out, and/or seal your gesso ground
Xander:
When I studied with Daniel Greene several years ago, he advised us to apply a light spritz of retouch varnish to our paintings each morning so as to bring up to proper value and "juicyness" the paint we used the preceeding day. Paint tends to sink in overnight.
One thing you could do to prevent this, to some degree, is to seal your gessoed ground with something like a little Liquin (alkyd medium) and turp or mineral spirits.
Another thing we used to do each day was something called "oil out." Oiling out is simply putting a light coat of your oil on the painting's surface prior to starting you painting that day.
Earth colors seem to be known for their "sinking in." They go dead, or flat overnight, sometimes, but as you continue to build paint levels and oil out, that will diminish considerably.
Whichever method you finally use, I believe it is important to bring the paint on your canvas up to the same degree of color, depth an "juicyness" as it was the day before while still wet. One of these methods should work for you.
Also, others on this forum may have some good ideas, also. They are full of good ideas.
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