What was the original 'failed' adhesive that led to the invention of Post-it Notes described as by its creator at 3M?

Product innovation often comes from unexpected places and sometimes even from failures. The journey from laboratory experiment to everyday essential can reveal fascinating stories about serendipity, persistence, and creative marketing. In this poll, test your knowledge about one of the most ubiquitous office products that resulted from an innovation 'accident' and how it eventually transformed into a global success through clever product development and marketing strategies.

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A super-strong adhesive that was too powerful for practical applications
A pressure-sensitive adhesive that was 'not very sticky'
A heat-activated glue that required too much energy to be commercially viable
A waterproof bonding agent that couldn't withstand high temperatures