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You can paint on the retouch varnish as soon as it's dry to the touch. Retouch varnishes should be reduced to the point of depositing as little resin as possible to be effective, and applied as sparingly as possible. As to the "window" an ideal application will sometimes allow a dead passage to "sink" again if left too long. Spot applications are better than varnishing the whole piece, unless the painting is small, and you intend to work "all over" rather than in passages.
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