Dave Hawksford
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on oils mix with varnishes. This is more so for the experts who want to do oil finishes , speed up the drying time and still have a finish that is hard , less yellowing and avoid checking.
http://www.sanders-studios.com/instruction/tutorials/historyanddefinitions/nationalgallery.html
http://www.sanders-studios.com/instruction/tutorials/historyanddefinitions/nationalgallery.html