Stop using messy glue. If you like to save your puzzle, this is your product! This puzzle preservation tool is quick and easy with no messy clean up or dry time preparation. There is no messy liquid glue or glue brushes. Simply peel off the protective paper and press it to the back of any completed puzzle. Puzzle Presto! bonds immediately and your puzzle is saved with its original pristine finish devoid of any bubbles, streaks or color runs. Preserves up to two 300pc/500pc puzzles or one 750pc/1000pc puzzle.