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Putty might do the work
Hi, I read somewhere before that in the National Gallery of Art in London, restorers use a type of putty to fill in the cracks of paintings. I believe the putty might be clay-based, as this might be the more "natural" element befitting to oil paints.
If all else fails, try this book title from the local library:
Conserving paintings : basic technical information for contemporary artists by Allan Byrne
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