A hairspray is a product that helps in keeping hair stiff for a certain hair style for a long period of time. It was first developed in 1948. Alcohol is no longer an important content of hair sprays. It is quickly being replaced by ingredients that are less damaging and provide the same kind of strength. Also it is not true that the strength of a hair spray is determined by the alcohol content in it. There are other factors at play such as a Pytocalcious chemicals which cause the hair to become stiff.