Pour all the gasoline/petrol into the metal container. Add some Styrofoam to this and keep stirring till dissolved. Keep repeating the process till you can’t add any more Styrofoam. You should now have sticky looking syrup.
WARNING: Do not touch Napalm, its dangerous.
That’s it. Your homemade napalm is ready for use. Make sure you never touch napalm directly or let it come in contact with skin. Once, prepared napalm can be stored for a really, really long time.