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I know of some very fine artists who do this because it means they no longer need to be involved once the check clears. People do all sorts of questionable things in my view. They add dammar varnish to mediums, use alkyd mediums, use Maroger medium, use acrylic grounds and use paint containing zinc.
I think a portrait artist has a responsibility to deliver archivally sound work that will last for many generations. A painting needs to be perfectly dry before the varnish can be applied. This includes Soluvar as well.
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