Edit: whoops, I missed the "il" part in "not illegal". Anyway you should definitely not do the following. Allegedly doing the following would be arson, and society frowns upon such things.
Easy:
- Identify company
- Wait until it's a weekend night. We're not after the wage slaves after all.
- Mix polystyrene and gasoline. Remember that gasoline can melt some plastics, so if using a plastic container for mixing do a test first. You do not want napalm all over the place.
- Fill the gooey substance in glass bottles.
- Cap the bottles. (see #7)
- Drive to the company.
- Open bottles and put wicks in them. (important not to do this earlier. Driving with open gasoline containers in your car will make you drowsy and is a fire hazard)
- If you haven't already got gloves on, put them on and wipe down the bottles - you may have to leave some at some point.
- Have accomplices trigger fire alarms all over the local fire department's district. Either automatic fire alarms will be discarded for a bit or the marshall will be tied up investigating.
- Light a wick, throw the bottle at the company, try to get it to break a window.
- If you're out of bottles or you see blue lights cheese it. Otherwise go back a step and repeat it.