I'm doing some paintings (acrylic paints) and one part of one of them will have bright primary yellow. The problem is that I sketched everything out in pencil on the canvas and the pencil lead mixed with the paint on contact. That layer has since dried but subsequent coats arn't fully covering it up. I'm worried glossing over it won't do the trick.
Any tips on how to fix it up?
Also, any other helpful tips about painting in general are appreciated, its been a while since I've done it!