Epifanes has been recommended by several builders. I myself am planning to give it a try when I run out of my current varnish (no more in production).
SOme folks add the Epifanes accelerator up to 50% which is mix of resins and other stuff that will make the varnish harder and more scratch resistant and will dry faster, essentially turning it into short-oil varnish.
I agree adding tung oil is strange as Epifanes is based on tung.
For spraying folks use acetone as thinner for oil varnishes. It will flesh off fast leaving just varnish to dry. Less risk of runs.
I don't know how different is my current varnish from Epifanes but I brush it straight from can (consistency of maple syrup) with relatively stiff brush (I found brushes from cheap IKEA set of child brshes work great and last) and 3-5 coats is all I need before I sand for French polish.
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