Also, in these situations, you never want to use the rag as a stopper for a bottle filled with gasoline. Instead, you cork the top, soak the rag in oil, and tie it around the bottle neck. Light the rag. When the bottle breaks, it'll ignite the theoretical napalm.

Doing this will keep the gas from spilling on you when you throw it. Safety first!

/s <-- this is all a joke, of course and we definitely don't condone violence or burning fascists.

Funny enough, I've done this before. The big issues is the styrofoam loses its fluff and you end up with a small glob. It'd be more effective to mix it in a bowl and pump it into the bottle.

I keep napalm for starting fires at home and camp. Can't be beat!

https://www.youtube.com/watch?v=KivCRqfFcqY