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Hello Chris:
Witnout doubt a large amount of stand oil will create a pretty high level of gloss, and the medium I spoke about does add a jewel like quality to the paint rather typical of stand oil and of canada balsam. I have not had any problems varnishing over the surface of paintings using this medium however. I always try to use no more than 20% medium to paint, and even when I do get a little more medium in the mix it has not been a problem for me.
I have found that one of the most important things about varnishing is temperature - both the temperature of the surface and the temperature of the varnish. Warmth of both really helps coverage, and reduces bubbles I find.
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