* It would be messy and sticky: Jell-O would likely leave your hair feeling stiff, sticky, and difficult to manage.
* It wouldn't actually set: Unlike hair gel, Jell-O won't harden on your hair.
* It could damage your hair: Jell-O contains sugar, which can dry out your hair and leave it brittle.
If you're looking for a hair styling product, try a gel, mousse, or spray specifically designed for hair.