What was the original 'failed' adhesive that led to the invention of Post-it Notes described as by its inventor?

In the world of inventions and discoveries, some products emerge by design, while others happen through fortunate accidents. The Post-it Note is one of the most famous examples of 'failed' research leading to a billion-dollar product. This poll explores the fascinating origin story behind one of 3M's most iconic inventions - a product that revolutionized how we organize information in offices worldwide and created an entirely new product category.

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A 'super-strong' adhesive that was too powerful for commercial use
A 'pressure-sensitive' adhesive that was too weak for industrial applications
A 'heat-activated' adhesive that required too much energy to be practical
A 'water-soluble' adhesive that dissolved too quickly in humid environments