Opti-Rite® Product Descriptions: Opti-Rite® Lite™ has a more permanent adhesive when it sets up and this is the product that we would recommend if you're resurfacing an existing whiteboard or worn out chalk board. Opti-Rite® Mag™ SA is a magnetic receptive dry erase material with a strong self-adhesive, peel and stick backing. This is an excellent solution for resurfacing existing marker boards or chalk boards. Opti-Rite® Clear™ is exactly what the name implies, clear. It can be used over existing whiteboards but it can also be used on a wall but note that the adhesive is pretty strong so when it sets up it will be pretty permanent. Opti-Rite® is a Registered Trademark of OptiMA® Inc.