In what way did the adhesive used in Post-it Notes initially fail to meet 3M's product development goals?

Some of the world's most successful products emerged from unexpected discoveries or failed experiments. The path from laboratory mishap to market success reveals fascinating insights about product development and innovation processes. This poll explores a famous 'failed' adhesive experiment that led to one of the most ubiquitous office products worldwide.

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It was too strong and permanently bonded materials together, causing damage when removed
It was too weak and temporarily adhesive, not meeting 3M's goal for a super-strong aerospace adhesive
It was water-soluble and dissolved when exposed to moisture, making it impractical for most applications
It was heat-activated and only worked at temperatures above 100°C, limiting its commercial applications