Road painting arrow technique - GIF

Road painting arrow technique.

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Previously:

https://www.homemadetools.net/forum/...808#post137021
https://www.homemadetools.net/forum/...232#post138510
https://www.homemadetools.net/forum/...720#post136795
https://www.homemadetools.net/forum/...638#post136459
https://www.homemadetools.net/forum/...891#post119616
https://www.homemadetools.net/forum/...221#post116003

Can anyone elaborate on what material they are using and what the flame near the spout or tip is about? It would seem to be a modified paint or even plastic substance?

the material is called Thermoplastic. Its melted in the hopper with a flame under it. The little fire at the bottom is a heater that keeps the "shoe" hot enough so that the thermoplastic doesn't cool and clog.

Cool. thanks!