Karin:
I have only seen one Vermeer. It was indeed enamel like. Although, I find that Rembrandt and other master paintings have the same sort of sheen. As to whether he used VT or not, I really don't know, sorry. Certainly Stand Oil does help contribute to the enamel quality of an oil film.
I use Venice Turpentine in the following medium:
5 parts Damar Varnish
5 parts Rectified Turpentine
3 parts Stand Oil
1 part Venice Turpentine
Cobalt Drier - 10-12 drops per 6 ounces
If you use the Talens VT, then you don't need the drier. Mayer also offers several medium recipies that include VT.
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