Napalm usually has gasoline with correct thickening agents. The first thickeners were soaps, aluminum, and magnesium palmitates and stearates. Depending on how much thickener is added, the resulting viscosity may range between syrupy liquid and thick rubbery gel. The content of long hydrocarbon chains makes the material highly hydrophobic (resistant to wetting with water), making it more difficult to extinguish(remove fire). Thickened fuel also bounce better, so it is better for missions in urban places.