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Old 18-11-04, 07:01 PM
Alessandra Kelley Alessandra Kelley is offline
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Join Date: May 2003
Location: Chicago, Illinois USA
Posts: 417
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If you let the paint dry for a few days to a week, you can paint over it with even more alacrity without picking up the underlayers. I like to work on several paintings at a time, to be able to leave them this long.

One painting I set aside for a few months, and when I went back to it nothing could budge the underpainting (perhaps if I had taken a screwdriver to it -- but no brush affected it, even when I picked up layers of more recent painting).

By the way, you may want to make deliberate use of that picking up technique. It can make for interesting effects.