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?

Question

You know the ones from the videos on Instagram.

In: Chemistry

Answer 1

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.