It looks like some learned practical instruction is finally making its way on to YouTube. The trick is finding them. Surprisingly, the keywords “oiling out” produced some interesting results:
Both videos above plug each company’s respective products, which in both cases recommend a painting medium. As I only use walnut oil as my binder/medium, I wonder if I could simply cut that with Sansador or turp and use that?
A good forum post on Wet Canvas on oiling out… though it would appear there is some confusion between the use of a medium to solve the problem vs. retouch varnish.
Other Good links: