In what way was the adhesive used in Post-it Notes initially considered a failure before becoming one of 3M's most successful products?

Many groundbreaking products we use daily resulted from unexpected discoveries or failed experiments. The journey from invention to market success often involves fascinating stories of persistence, serendipity, and creative problem-solving. This trivia question explores one of the most iconic accidental inventions in office supply history that revolutionized how we organize information and communicate notes.

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It was too weak and couldn't form permanent bonds as intended
It was too expensive to manufacture at scale compared to traditional glues
It caused paper discoloration when exposed to sunlight for extended periods
It had an unpleasant odor that customers complained about in early testing