Which famous adhesive product was originally developed as part of a failed attempt to create a super-strong glue, but became successful when its 'weakness' was recognized as a valuable feature?

The path from invention to successful product is often filled with fascinating detours and unexpected discoveries. Throughout history, many groundbreaking products were originally developed for entirely different purposes than what made them famous. Test your knowledge about one of the most surprising product development pivots that changed an everyday item we now take for granted.

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Post-it Notes (originally a weak adhesive that 3M researchers realized could be used for temporary attachments)
Gorilla Glue (originally developed as a waterproof coating for ships but found to be too sticky)
Super Glue (originally designed as a clear plastic for gun sights during WWII but discovered to bond skin)
Elmer's Glue (originally created as a rubber substitute during wartime shortages but found too weak for industrial use)