Even if you've seen Silly String in action, it's hard to understand what exactly it is. It starts off as a liquid inside an aerosol can. But once you spray it, it turns into lightweight, slightly sticky string that will cling to all sorts of things. Acrylic resin gives the string its plastic quality and a surfactant, or surface-active agent, causes the resin to foam. Lots of propellant causes the resin and surfactant to react with each other, and to form a skin-like covering on the foam.
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