Not necessarily. As the colors get soaked very well in the Canvas, you don't need to put a Glass on top to protect the colors. Unlike pastle colors, which stay on top of the Canvas, Oil basked inks get soaked well and become an integral part of the fabric like colors on a Kurta or a Saree. Because of this, the painting can be cleaned with a clean damp cloth once in a while and the colors don't get smudged.