Which famous adhesive product was initially considered a failure because it was deemed 'not sticky enough' for its intended purpose?

Many world-changing products began as happy accidents or were designed for entirely different purposes than what made them famous. This trivia explores the fascinating origin story of a product that revolutionized its industry despite its unusual beginnings. Test your knowledge of product development history and the unexpected twists that led to marketplace success!

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Post-it Notes (originally called 'Press 'n Peel')
Super Glue (cyanoacrylate adhesive)
Scotch Tape (originally called 'Scotch Brand Cellulose Tape')
Elmer's Glue (polyvinyl acetate adhesive)