Napalm is flammable liquid used in warfare. It is a mixture of a gelling agent and petroleum or a similar fuel.It was initially used as an incendiary device against buildings and later primarily as an anti-personnel weapon, as it sticks to skin and causes severe burns when on fire.apalm was first employed in incendiary bombs and went on to be used as fuel for flamethrowers. The first recorded strategic use of napalm incendiary bombs occurred in an attack by the US Army Air Force on Berlin on 6 March 1944, using American AN-M76 incendiary bombs with PT-1 (Pyrogel) filler.