Asoki Planner pages have been coated to allow you to erase the pages easily with a drop of liquid. The Asoki Planner, however, is not waterproof. Specifically, the edges of the pages are not waterproof. When erasing, spray liquid onto the middle of the page, or onto the wipe. Then wipe the edges with the cloth. Avoid spraying or spilling liquid directly onto the edges of pages.
The covers and discs are water resistant, they contain no paper or cardboard.