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Tarting up old paintings
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You can always zhoosh up an old acrylic - dangerous to do that with oils after a certain period of time has elapsed (though actually - you still can, especially if the paint isn't on a flexible support) but acrylic can take a good deal of over-working; you can even paint a white "gesso" over old work, and treat the board as a new painting exercise - but you will find bits that stick up and catch your brush or knife, if you don't sand down the old painting first. If your paintings are on paper, I might be a little less keen to bother with them; rather, just start again on a new sheet. But if they're on board, or even stretched canvas, you should have no real problems in either short or long term.