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ReNae:
Graphite is a not the best choice for sketching under oil paints. Graphite is very slick and oils don't stick well to slick surfaces. Further, I have met several artists who claim that over time, graphite will leech through your paint.
Charcoal is an excellent choice.
I fix my underdrawings with Damar Retouch Varnish. It is an appropriate choice for an oil over painting. It isolates the charcoal and keeps it from smearing, and it prepares the surface for oil imposition over it.
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