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While it's probably better not to fool with retouch varnishes and the like, I can understand why one would want to quickly simulate varnish like conditions particularly where clients are concerned.
I discovered in Gamblin's "Notes of Special Interest" you can in fact make a retouch varnish by mixing "1 part Gamvar Varnish with 5 parts Gamsol or other high quality OMS."
The question then arises whether in 6 months time the Gamvar retouch should be removed or left on before varnishing with the full strength product.
Also in his notes Gamblin mentions using cold wax medium as a matting agent. When I see the word "wax" I think of Reynolds and his questionable practices. Perhaps when wax is used in varnish as opposed to medium it's another story.
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