Yes, as you know, watercolor pens are generally divided into water-based watercolor pens and oily watercolor pens. Water-based markers are not easy to overlap, and the color will turn gray after repeated coverage, which is easy to hurt the paper. Oily marker feels good and moist, and it doesn't matter if the colors are superimposed many times. Recommended, American Sanfu or domestic imitation products, although the quality is similar, but the price is low and suitable for beginners.
After the color dries, pencil marks can still be erased with soft rubber.
The color penetration you mentioned has something to do with paper. With an oil-based pen, the greater the water absorption of paper, the more obvious the effect of handwriting smudging. If you don't want to penetrate too much, you can use special marking paper or smoother paper.