Sandy, some artists do exactly that, and then cover with a thin layer of damar mixed with an earth color (like Indian Red). I have done this with a small pastel drawing, but haven't tried it on canvas yet. They say that you should use retouch varnish to fix the drawing, but I believe that retouch varnish (damar+turps) will cause the drawing to melt, unless you use fixative first.
I know that I read that Bouguereau fixed his drawings on his canvases, but I'm not sure what he fixed them with. I know that Grumbacher workable fixative works well, but I'm not sure for how many years. I have a drawing done like that, that has lasted seven years without a problem.
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