Sketching on Canvas

[ReNae Stueve]

I've a question about materials to use for my sketch on canvas that I like (need) to do before I begin to paint. I'm reminded of the lesson I learned using graphite under pastels. Nope, pastel won't adhere to graphite. So, can I use charcoal or better yet graphite, (my strength)without worry about bleeding or flaking?

Lemme know what you know.

Thanks