Expo Vis-a-Vis Wet Erase markers create clear, bright images on overhead projectors and transparencies. It is perfect for use as a template on whiteboards or erasable calendars. You can even use for laminated surfaces and even storage totes. This uniquely formulated ink remains in place until you are ready to wipe it away. Ideal for scheduling, charting and tracking. Simply wipes off non-porous surfaces with a damp cloth. Certified AP ink lets you have more fun, no worries.