Which accidental laboratory discovery led to one of the most widely used adhesive products, originally rejected because it was considered too weak?

Throughout history, certain product innovations have completely transformed how we live, work, and communicate. Behind many of these revolutionary inventions are fascinating stories of discovery, persistence, and sometimes even luck. This trivia question explores a groundbreaking innovation that dramatically changed an entire industry and consumer behavior worldwide. Test your knowledge about the development of this game-changing product and its impact on society!

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Post-it Notes (Spencer Silver's 'low-tack' adhesive at 3M)
Super Glue (Harry Coover's cyanoacrylate while working on plastic gun sights)
Scotchgard (Patsy Sherman's fluorochemical spill on tennis shoes)
Velcro (George de Mestral's observation of burrs sticking to his dog)