Sketch Paint Clear Coating Purchased for around ¥20,000 and left over from a DIY project. When applied to a smooth surface, you can write on it with a whiteboard marker and erase it, just like a whiteboard. Because this material is clear, you can create an original board by applying a base coat of your favorite color. For materials not suitable for painting, such as wallpaper, boards with a rough grain, or uneven surfaces, it's best to prepare the surface beforehand. Instruction manual and pamphlet included, but you can also find information online. 1L can cover approximately 6 square meters. As this is paint, I cannot be held responsible for any issues or mistakes after application. Multiple units available.