eli5: What is the hot material they pour into the rolling thing to line stripe & write things like “stop” on the road and how does it instantly dry?

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You know the ones from the videos on Instagram.

In: Chemistry
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It’s hot melted stuff. It’s not “drying” so much as “cooling” when it hits the pavement. The pavement has a lot of heat capacity, so it only takes seconds to get the stuff to the ambient pavement temperature.

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It’s not paint but a type of thermoplastic like what pop bottles are made of but a different molecule. It’s a specific type made to melt to a very liquid state. The thinness of the layer makes it cool in seconds