HELP/MFAQ: Premium WriteyBoard 90-day Warranty:

Premium WriteyBoards are a self-adhering, restickable whiteboard solution.
• Guaranteed to stick and restick to your surface for up to 90 days (but will probably last much longer).
• Guaranteed to always erase. 
• Guaranteed to leave no residue

Premium WriteyBoard’s details are outlined in “Boards” faq section