Usually I trace the drawing and transfer it to the board (gessoed masonite) using conte as a transfer medium. Then I spray fix it (Krylon Workable Fixatif), let it dry, and then start with an oil wash (with turpentine).
Spray Fix, if sprayed heavily, changes the surface of the gesso, making it noticeably less absorbent. So on my last painting, I decided to spray the Fix on much lighter to try to keep the original character of the gesso.
However, much to my surprise, when I did the oil wash over this tracing, the turpentine melted the drawing completely--and I mean completely. It was a pretty complicated, multi-figure thing, but luckily, I had the original tracing. All I lost was a couple of hours, which was highly annoying, but not a tragedy. Never had this happen before, but clearly, with an oil wash, the SprayFix on the drawing has to be pretty thick.
Ken
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